Proceeds from sale
Proceeds from Divestiture of Businesses
Accumulated Amortization
Finite-Lived Intangible Assets, Accumulated Amortization
Property operating expenses
Property operating expenses
Cost of Other Property Operating Expense
Conversion of common units
Exchangeable Common Units [Member]
Incremental weighted average common shares attributable to common units in the operating partnership that may be exchanged for common shares.
314 Sentinel Way
314 Sentinel Way [Member]
Represents the information pertaining to 314 Sentinel Drive, an office property owned by the entity.
4.50%, $400,000 aggregate principal
Unsecured Senior Notes Due October 2030 [Member]
Unsecured Senior Notes Due October 2030
GMP
Guaranteed Maximum Price [Member]
Guaranteed Maximum Price [Member]
Award Timing Predetermined
Award Timing Predetermined [Flag]
Entity File Number
Entity File Number
6950 Columbia Gateway Drive
6950 Columbia Gateway Drive [Member]
Represents the information pertaining to 6950 Columbia Gateway Drive, an office property owned by the entity.
Additional Paid-in Capital
Additional Paid-in Capital [Member]
North Gate Business Park
North Gate Business Park [Member]
Represents the information pertaining to North Gate Business Park, an office property owned by the entity.
Tabular List, Table
Tabular List [Table Text Block]
7150 Riverwood Drive
7150 Riverwood Drive [Member]
Represents the information pertaining to 7150 Riverwood Drive, an office property owned by the entity.
Recent Accounting Pronouncements
New Accounting Pronouncements, Policy [Policy Text Block]
Write-offs
Financing Receivable, Allowance for Credit Loss, Writeoff
Deferred leasing costs (net of accumulated amortization of $44,127 and $44,060, respectively)
Deferred Costs, Leasing, Net
4600 River Road
4600 River Road [Member]
4600 River Road [Member]
Maximum exposure
Guarantor Obligations, Maximum Exposure, Undiscounted
PIUs
Profit Interest Units [Member]
Profit Interest Units [Member]
6700 Alexander Bell Drive
6700 Alexander Bell Drive [Member]
Represents the information pertaining to 6700 Alexander Bell Drive, an office property owned by the entity.
Measurement Basis [Axis]
Measurement Basis [Axis]
Adjustment to Compensation:
Adjustment to Compensation [Axis]
Named Executive Officers, Footnote
Named Executive Officers, Footnote [Text Block]
7138 Columbia Gateway Drive
7138 Columbia Gateway Drive [Member]
Represents the information pertaining to 7138 Columbia Gateway Drive, an office property owned by the entity.
Operating lease cost
Operating Lease Cost [Abstract]
Operating Lease Cost
Construction Contract and Other Service Revenues
Revenue from Contract with Customer [Text Block]
Environmental Indemnity Agreement
Environmental Indemnity Agreement [Abstract]
Building and Land Improvements
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Building and Improvements, Amount
Stock, Class of Stock [Table]
Stock, Class of Stock [Table]
Continuing Operations
Continuing Operations [Member]
Area of real estate property (in sqft or acres)
Area of Real Estate Property
Adjustment to Compensation, Amount
Adjustment to Compensation Amount
Percentage of revenue
Concentration Risk, Percentage
Initial Cost
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Share-based compensation
Share-Based Payment Arrangement, Noncash Expense
400 National Business Parkway
400 National Business Parkway [Member]
400 National Business Parkway
Employee Stock Option
Share-Based Payment Arrangement, Option [Member]
Schedule of Property, Plant and Equipment [Table]
Property, Plant and Equipment [Table]
7170 Riverwood Drive
7170 Riverwood Drive [Member]
Represents the information pertaining to 7170 Riverwood Drive, an office property owned by the entity.
Cash and Cash Equivalents
Cash and Cash Equivalents, Policy [Policy Text Block]
Investing receivables (net of allowance for credit losses of $3,575 and $2,792, respectively)
Investing receivables, net
Financing Receivable, after Allowance for Credit Loss
7015 Albert Einstein Drive
7015 Albert Einstein Drive [Member]
Represents the information pertaining to 7015 Albert Einstein Drive, an office property owned by the entity.
Quark JV LLC
Quark JV LLC [Member]
Quark JV LLC
Income taxes paid
Income Taxes Paid
Antidilutive Securities Excluded from Computation of Earnings Per Share, by Antidilutive Securities [Axis]
Antidilutive Securities [Axis]
Aggregate intrinsic value of shares issued
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Vested
Impairment losses
Impairment losses
Impairment losses
Asset Impairment Charges
Total shareholders’ equity
Equity, Attributable to Parent
Investment in unconsolidated real estate joint ventures
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures [Member]
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures
Other comprehensive loss
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Insider Trading Policies and Procedures [Line Items]
Schedule of Estimated Useful Lives of Fixed Assets
Schedule of Operating Properties, Net
Property, Plant and Equipment [Table Text Block]
Common shares of beneficial interest, shares authorized (in shares)
Common Stock, Shares Authorized
6760 Alexander Bell Drive
6760 Alexander Bell Drive [Member]
Represents the information pertaining to 6760 Alexander Bell Drive, an office property owned by the entity.
16541 Commerce Drive
16541 Commerce Drive [Member]
Represents the information pertaining to 16541 Commerce Drive, an office property owned by the entity.
Liabilities and equity
Liabilities and Equity [Abstract]
Cover [Abstract]
Cover [Abstract]
Portion at Fair Value Measurement
Portion at Fair Value Measurement [Member]
8671 Robert Fulton Drive
8671 Robert Fulton Drive [Member]
Represents the information pertaining to 8671 Robert Fulton Drive, an office property owned by the entity.
Maximum
Maximum
Maximum [Member]
Properties, net
Real Estate Investment Property, Net [Abstract]
Reclassification of redeemable noncontrolling interests to equity
Reclassification of Stevens Investors, LLC interests to equity
Noncontrolling Interest, Increase (Decrease) for Reclassification of Redeemable Noncontrolling Interest to Equity
Noncontrolling Interest, Increase (Decrease) for Reclassification of Redeemable Noncontrolling Interest to Equity
2.00%, $400,000 aggregate principal
Unsecured Senior Notes Due January 2029 [Member]
Unsecured Senior Notes Due January 2029
Restricted shares
Restricted Stock [Member]
Non-PEO NEO Average Total Compensation Amount
Non-PEO NEO Average Total Compensation Amount
Real Estate and Accumulated Depreciation, by Property [Table]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, by Property [Table]
Debt
Debt Instrument [Line Items]
Debt Instrument [Line Items]
Fixed Lease Revenue From Continuing Operations Benchmark
Fixed Lease Revenue From Continuing Operations Benchmark [Member]
Fixed Lease Revenue Benchmark [Member]
Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table]
Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table]
Costs Capitalized Subsequent to Acquisition
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Cost Capitalized Subsequent to Acquisition, Cost
Lessee, remaining term of contract
Lessee, Remaining Term of Contract
Lessee, Remaining Term of Contract
Land controlled for development
Land Controlled For Development [Member]
Represents land controlled by the entity for future development.
Investment grade
Internal Investment Grade [Member]
Adjustment to Non-PEO NEO Compensation Footnote
Adjustment to Non-PEO NEO Compensation Footnote [Text Block]
Financing Receivable, Credit Quality Indicator [Table]
Financing Receivable, Credit Quality Indicator [Table]
Oak Grove C
Oak Grove C [Member]
Oak Grove C
114 National Business Parkway
114 National Business Parkway [Member]
Represents the information pertaining to 114 National Business Parkway, an office property owned by the entity.
Forgone Recovery due to Disqualification of Tax Benefits, Amount
Forgone Recovery due to Disqualification of Tax Benefits, Amount
Other Assets
Other Assets [Member]
Non-Rule 10b5-1 Arrangement Terminated
Non-Rule 10b5-1 Arrangement Terminated [Flag]
7880 Milestone Parkway
7880 Milestone Parkway [Member]
Number 7880 Milestone Parkway [Member]
Entity Shell Company
Entity Shell Company
Common Shares
Common Stock, Number of Shares, Par Value and Other Disclosure [Abstract]
Schedule of the Fair Value of Debt
Schedule of Carrying Values and Estimated Fair Values of Debt Instruments [Table Text Block]
Schedule of Long-term Debt Instruments [Table]
Schedule of Long-Term Debt Instruments [Table]
Proceeds from issuance of debt
Proceeds from Issuance of Debt
Changes in accumulated depreciation
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward]
Statement of Stockholders' Equity [Abstract]
Statement of Stockholders' Equity [Abstract]
Reportable segments
Operating Segments [Member]
2720 Technology Drive
2720 Technology Drive [Member]
Represents the information pertaining to 2720 Technology Drive, an office property owned by the entity.
Property operating expenses
Property Operating Expense [Member]
Represents the allocation (or location) of expenses to (in) property operating expense.
Unrealized income on interest rate derivatives
Amount of Income Recognized in AOCI on Derivatives
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, after Tax
Comprehensive (income) loss attributable to noncontrolling interests
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest
Award Timing MNPI Considered
Award Timing MNPI Considered [Flag]
Schedule of Reporting for Share-Based Compensation Cost
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block]
Interest on lease liabilities
Finance Lease, Interest Expense
Schedule of Reconciliation of UJV NOI Allocable to COPT Defense to Equity in Income (Loss) of Unconsolidated Entities
Schedule of Reconciliation of Unconsolidated Joint Venture Net Operating Income to Equity in Income of Unconsolidated Entities [Table Text Block]
Schedule of Reconciliation of Unconsolidated Joint Venture Net Operating Income to Equity in Income of Unconsolidated Entities [Table Text Block]
Document Fiscal Period Focus
Document Fiscal Period Focus
PB PIU Grants 2023
PB PIU Grants 2023 [Member]
PB PIU Grants 2023
Percentage of cumulative preferred returns of cash flows on partners' invested capital
Percentage of Cumulative Preferred Returns of Cash Flows on Partners Invested Capital
Percentage of Cumulative Preferred Returns of Cash Flows on Partners Invested Capital
Rents received in advance and security deposits
Advance Rent and Security Deposit Liability
Amount at the balance sheet date that has been received by the entity that represents collections of cash or other assets related to real estate operations revenue for which revenue has not yet been recognized and money paid in advance to protect the provider of a product or service, such as a lessor, against damage or nonpayment by the buyer or tenant (lessee) during the term of the agreement. Such damages may include physical damage to the property, theft of property, and other contractual breaches. Security deposits held may be interest or noninterest bearing.
5522 Research Park Drive
5522 Research Park Drive [Member]
Represents the information pertaining to 5522 Research Park Drive, an office property owned by the entity.
Award Timing Method
Award Timing Method [Text Block]
Net (income) loss attributable to noncontrolling interests
Net Income (Loss) Attributable to Noncontrolling Interest [Abstract]
Award Type [Axis]
Award Type [Axis]
2028
Sales-Type and Direct Financing Leases, Payment to be Received, Year Three
44408 Pecan Court
44408 Pecan Court [Member]
Represents the information pertaining to 44408 Pecan Court, an office property owned by the entity.
Investment, Name [Domain]
Investment, Name [Domain]
Schedule of PB-PIU's Granted
Schedule of Share Based Compensation by Award, Performance Shares and Units, Grants [Table Text Block]
Tabular disclosure of information pertaining to grants of performance shares/units.
Share-Based Compensation
Share-Based Payment Arrangement [Policy Text Block]
Cumulative Distributions in Excess of Net Income
Accumulated Distributions in Excess of Net Income [Member]
Trading Symbol
Trading Symbol
2029
Lessee, Operating Lease, Liability, to be Paid, Year Four
Acquisition of Operating Properties
Business Combination [Policy Text Block]
550 National Business Parkway
550 National Business Parkway [Member]
550 National Business Parkway
Share-based compensation issuance, net of redemptions (in shares)
Shares Issued, Shares, Share-Based Payment Arrangement, after Forfeiture
Entity Address, City or Town
Entity Address, City or Town
Weighted average restricted shares and deferred shares
Restricted Stock and Deferred Shares [Member]
Restricted Stock and Deferred Shares [Member]
Finance leases, weighted average discount rate
Finance Lease, Weighted Average Discount Rate, Percent
Credit Losses, Financial Assets and Other Instruments [Table]
Credit Losses, Financial Assets and Other Instruments [Table]
Credit Losses, Financial Assets and Other Instruments [Table]
Class of Financing Receivable [Axis]
Class of Financing Receivable [Axis]
Non-PEO NEO Average Compensation Actually Paid Amount
Non-PEO NEO Average Compensation Actually Paid Amount
Statement of Income Location, Balance [Domain]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs, Report Line [Domain]
Statement of Income Location, Balance [Domain]
Sales
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation, Investment in Real Estate Sold
Executives and Non-Employee Trustees
Executives and Non-Employee Trustees [Member]
Executives and Non-Employee Trustees
Compensation Actually Paid vs. Other Measure
Compensation Actually Paid vs. Other Measure [Text Block]
4851 Stonecroft Boulevard
4851 Stonecroft Boulevard [Member]
Represents the information pertaining to 4851 Stonecroft Boulevard, an office property owned by the entity.
22309 Exploration Drive
22309 Exploration Drive [Member]
Represents the information pertaining to 22309 Exploration Drive, an office property owned by the entity.
Credit Losses on Financial Assets and Other Instruments
Credit Loss, Financial Instrument [Text Block]
Entity Emerging Growth Company
Entity Emerging Growth Company
2028
Long-Term Debt, Maturity, Year Three
Investing Receivables
Investing Receivables
Investing Receivables
Investing Receivables [Member]
Investing Receivables [Member]
Finance leases, weighted average remaining lease term
Finance Lease, Weighted Average Remaining Lease Term
Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year
Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year [Member]
Net deferred financing costs
Debt Issuance Costs, Net
Percentage of residual distributable cash flows in excess of unpaid cumulative preferred returns and return of invested capital entitled to the entity's partners
Percentage Of Residual Distributable Cash Flows Entitled In Excess Of Unpaid Cumulative Preferred Returns and Return of Invested Cash Related To Real Estate Partner
Represents the percentage of residual distributable cash flowsin excess of unpaid cumulative preferred turns and return of invested cash in the joint venture to which the entity's partners will be entitled.
Less: Amount representing interest
Finance Lease, Liability, Undiscounted Excess Amount
Common shares of beneficial interest, shares outstanding (in shares)
Beginning balance (in shares)
Ending balance (in shares)
Common Stock, Shares, Outstanding
1000 Redstone Gateway
1000 Redstone Gateway [Member]
Represents the information pertaining to 1000 Redstone Gateway, an office property owned by the entity.
Net credit loss expense (recoveries)
Accounts Receivable, Credit Loss Expense (Reversal)
Schedule of Construction Contract and Other Service Revenues by Compensation Arrangement
Disaggregation of Revenue [Table Text Block]
Minimum payout percentage if TSR percentile rank exceeds the 50th percentile and TSR is negative
Share-Based Compensation Arrangement by Share-Based Payment Award, Minimum Payout Percentage When Total Shareholder Return (TSR) Percentile Rank Exceeds 50th Percentile and TSR Is Negative
Share-Based Compensation Arrangement by Share-Based Payment Award, Minimum Payout Percentage When Total Shareholder Return (TSR) Percentile Rank Exceeds 50th Percentile and TSR Is Negative
Class of Financing Receivable [Domain]
Class of Financing Receivable [Domain]
Noncontrolling Interests
Noncontrolling Interest [Policy Text Block]
Disclosure of accounting policy for noncontrolling interest.
Navy Support
Navy Support [Member]
Navy Support [Member]
Unsecured senior notes
Proceeds from Issuance of Senior Long-Term Debt
Long-term capital gain
Dividends Declared Long Term Capital Gain Percentage
Dividends Declared Long Term Capital Gain Percentage
Awards settled (in shares)
Share-Based Compensation Arrangement by Share-Based Payment Award, Shares Issued in Period
Building and Land Improvements
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost of Building and Improvements
Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year
Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year [Member]
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Accounts payable and accrued expenses
Accounts Payable and Accrued Liabilities
7067 Columbia Gateway Drive
7067 Columbia Gateway Drive [Member]
Represents the information pertaining to 7067 Columbia Gateway Drive, an office property owned by the entity.
Number of Shares
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Effective interest rate on debt
Debt Instrument, Interest Rate, Effective Percentage
Pledged Status [Domain]
Pledged Status [Domain]
Entity Address, Postal Zip Code
Entity Address, Postal Zip Code
Restatement Determination Date
Restatement Determination Date
Income tax expense
Income tax expense
Income Tax Expense (Benefit)
Estimated lives over which depreciation is recognized
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Life Used for Depreciation
Variable rate, spread over SOFR
Variable rate, spread
Debt Instrument, Basis Spread on Variable Rate
Pension Adjustments Service Cost
Pension Adjustments Service Cost [Member]
Designated
Designated as Hedging Instrument [Member]
PB PIU Grants 2022
PB PIU Grants 2022 [Member]
PB PIU Grants 2022
Subsegments [Axis]
Subsegments [Axis]
Fair Value Hierarchy and NAV [Axis]
Fair Value Hierarchy and NAV [Axis]
210 Research Boulevard
210 Research Boulevard [Member]
Represents the information pertaining to 210 Research Boulevard, an office property owned by the entity.
Less: Income from UJVs allocable to COPT Defense attributable to depreciation and amortization expense, interest expense and loss on early extinguishment of debt
Income (Loss) from Equity Method Investments Allocable to Depreciation, Amortization, Interest Expense And Gain (Loss) On Debt Extinguishment
Income (Loss) from Equity Method Investments Allocable to Depreciation, Amortization, Interest Expense And Gain (Loss) On Debt Extinguishment
Sentry Gateway - Y
Sentry Gateway - Y [Member]
Represents the information pertaining to Sentry Gateway - Y, an office property owned by the entity.
322 Sentinel Way
322 Sentinel Way [Member]
Represents the information pertaining to 322 Sentinel Drive, an office property owned by the entity.
44420 Pecan Court
44420 Pecan Court [Member]
Represents the information pertaining to 44420 Pecan Court, an office property owned by the entity.
134 National Business Parkway
134 National Business Parkway [Member]
Represents the information pertaining to 134 National Business Parkway, an office property owned by the entity.
Unsecured note payable
Notes Payable, Other Payables [Member]
Compensation Actually Paid vs. Company Selected Measure
Compensation Actually Paid vs. Company Selected Measure [Text Block]
Buildings and building improvements
Buildings and improvements
Building and improvements
Building and Building Improvements [Member]
All Trading Arrangements
All Trading Arrangements [Member]
Equity Awards Adjustments, Footnote
Equity Awards Adjustments, Footnote [Text Block]
Total Shareholder Return Vs Peer Group
Total Shareholder Return Vs Peer Group [Text Block]
Redemption price
Debt Instrument, Redemption Price, Percentage
Interest rate swaps designated as cash flow hedges
Interest Rate Cash Flow Hedge Asset at Fair Value
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation Disclosure [Abstract]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation Disclosure [Abstract]
Columbia Gateway - Southridge
Columbia Gateway - Southridge [Member]
Represents the information pertaining to Columbia Gateway - Southridge, an office property owned by the entity.
Unvested at the beginning of the period (in shares or units)
Unvested at the end of the period (in shares or units)
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number
All Other Employees
All Other Employees Except Executives and Non-Employee Trustees [Member]
All Other Employees Except Executives and Non-Employee Trustees
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies Disclosure [Abstract]
Real Estate Joint Ventures
Real Estate Joint Ventures Disclosure [Text Block]
This block of text may be used to disclose details concerning consolidated and unconsolidated real estate joint ventures.
5.25%, $345,000 aggregate principal
Unsecured Senior Notes Due September 2028 [Member]
Unsecured Senior Notes Due September 2028
Net cash provided by operating activities
Cash Provided by (Used in) Operating Activity, Including Discontinued Operation
Project EL 2
Project EL 2 [Member]
Project EL 2
13454 Sunrise Valley Drive
13454 Sunrise Valley Drive [Member]
Represents the information pertaining to 13454 Sunrise Valley Drive, an office property owned by the entity.
Equity Method Investments and Joint Ventures [Abstract]
Equity Method Investments and Joint Ventures [Abstract]
Buildings improvements
Building Improvements [Member]
Number of preferred shares of beneficial interest authorized (in dollars per share)
Preferred Stock, Par or Stated Value Per Share
Estimated useful life
Property, Plant and Equipment, Useful Life
Subsequent Event
Subsequent Event [Member]
Real Estate [Line Items]
Real Estate [Line Items]
Revenues from real estate operations received
Revenues from Real Estate Operations Received
Cash received for rents, tenant recoveries and other real estate operations during the current period.
132 National Business Parkway
132 National Business Parkway [Member]
Represents the information pertaining to 132 National Business Parkway, an office property owned by the entity.
Schedule of Equity Method Investments [Line Items]
Schedule of Equity Method Investments [Line Items]
Equity Valuation Assumption Difference, Footnote
Equity Valuation Assumption Difference, Footnote [Text Block]
PEO Total Compensation Amount
PEO Total Compensation Amount
Long-term Debt, Type [Axis]
Long-Term Debt, Type [Axis]
Performance Based Grants 2024
Performance Based Grants 2024 [Member]
Performance Based Grants 2024
Interest rate
Note Receivable, Terms, Interest Rate
Note Receivable, Terms, Interest Rate
2029
Finance Lease, Liability, to be Paid, Year Four
Fair value of derivative liability
Derivative Liability, Subject to Master Netting Arrangement, before Offset
3900 Rogers Road
3900 Rogers Road [Member]
3900 Rogers Road
Numerator
Net Income (Loss) Available to Common Stockholders, Diluted [Abstract]
340th Trail
340th Trail [Member]
Number 340th Trail
Statement, Equity Components [Axis]
Equity Components [Axis]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment [Line Items]
Investments in real estate
Operating properties, net
Real Estate Properties [Line Items]
Increase in redeemable noncontrolling interests and decrease in equity to adjust for changes in fair value of redeemable noncontrolling interests
Adjustment for changes in fair value of interests
Noncontrolling Interest, Change in Redemption Value
44417 Pecan Court
44417 Pecan Court [Member]
Represents the information pertaining to 44417 Pecan Court, an office property owned by the entity.
44414 Pecan Court
44414 Pecan Court [Member]
Represents the information pertaining to 44414 Pecan Court, an office property owned by the entity.
Non-Rule 10b5-1 Arrangement Adopted
Non-Rule 10b5-1 Arrangement Adopted [Flag]
Operating expenses
Operating Costs and Expenses [Abstract]
Contract with Customer, Basis of Pricing [Axis]
Contract with Customer, Basis of Pricing [Axis]
Number of reportable segments
Number of Reportable Segments
8661 Robert Fulton Drive
8661 Robert Fulton Drive [Member]
Represents the information pertaining to 8661 Robert Fulton Drive, an office property owned by the entity.
Fair value of interest rate swaps
Interest Rate Derivatives, at Fair Value, Net
Receivables and Credit Losses
Receivable and Credit Losses [Policy Text Block]
Receivable and Credit Losses
Entity Address, State or Province
Entity Address, State or Province
7467 Ridge Road
7467 Ridge Road [Member]
Represents the information pertaining to 7467 Ridge Road, an office property owned by the entity.
Financing cash flows for finance leases
Finance Lease, Principal Payments
Thereafter
Sales-Type and Direct Financing Leases, Payment to be Received, after Year Five
Acquisitions of operating properties
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Other Acquisition
Antidilutive Security, Excluded EPS Calculation [Table]
Antidilutive Security, Excluded EPS Calculation [Table]
5825 University Research Court
5825 University Research Court [Member]
Represents the information pertaining to 5825 University Research Court, an office property owned by the entity.
Construction commencement completed (in sqft)
Construction Commencement Threshold, Completed
Represents a completed threshold for square footage of construction commencement for Company to be able to acquire partner's interest after five years.
Performance Based Grants 2023
Performance Based Grants 2023 [Member]
Performance Based Grants 2023
Individual:
Individual [Axis]
Operating leases
Lessor, Operating Lease, Payment to be Received, Fiscal Year Maturity [Abstract]
Recognition of finance lease right-of-use assets and related lease liabilities
Right-of-Use Asset Obtained in Exchange for Finance Lease Liability
Common share dividends paid
Payments of Ordinary Dividends, Common Stock
Document Annual Report
Document Annual Report
Earned performance based awards payout granted on 25th percentile rank
Share-based Compensation Arrangement by Share-based Payment Award of Earned, Payout Percentage Based on Percentile Rank Equals to 25
Represents the earned payout, as a percentage of target , if the entity's total shareholder return relative to a peer group of companies ranks at the 25th percentile.
Canton Crossing Util Distr Ctr
Canton Crossing Util Distr Ctr [Member]
Represents the information pertaining to Canton Crossing Util Distr Ctr, an office property owned by the entity.
Sentry Gateway - X
Sentry Gateway - X [Member]
Represents the information pertaining to Sentry Gateway - X, an office property owned by the entity.
Revolving Development Facility
Revolving Development Facility [Member]
Revolving Development Facility
Period after the cessation of major construction activities for considering property as operational if leases have not commenced earlier (in years)
Period after Cessation of Major Construction Activities for Considering Property to be Operational if Leases have not Commenced Earlier
Represents the period after the cessation of major construction activities for considering property as operational if leases have not commenced earlier.
Forgone Recovery, Explanation of Impracticability
Forgone Recovery, Explanation of Impracticability [Text Block]
2022
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year
Leases
Lessor, Sales-type Leases [Text Block]
Entity Interactive Data Current
Entity Interactive Data Current
At-market-stock, offering program established, aggregate value
At Market Stock, Offering Program Established, Aggregate Value
Aggregate gross sales price of common shares that may be issued in an at-the-market stock offering program established by the Company.
Increase (decrease) in accounts payable, accrued expenses and other liabilities
Increase (Decrease) in Operating Liabilities
Ownership percentage sold
Ownership Percentage Sold
Ownership Percentage Sold
Oak Grove B
Oak Grove B [Member]
Oak Grove B [Member]
Disaggregation of Revenue [Table]
Disaggregation of Revenue [Table]
Redstone Gateway
Redstone Gateway [Member]
Represents the information pertaining to Redstone Gateway, an office property owned by the entity.
College Park, Maryland
College Park, Maryland [Member]
College Park, Maryland [Member]
Property, Plant and Equipment, Type [Axis]
Property, Plant and Equipment by Type [Axis]
Long-Lived Tangible Asset [Axis]
7150 Columbia Gateway Drive
7150 Columbia Gateway Drive [Member]
Represents the information pertaining to 7150 Columbia Gateway Drive, an office property owned by the entity.
2025
Financing Receivable, Year One, Originated, Current Fiscal Year
2.90%, $400,000 aggregate principal
Unsecured Senior Notes Due December 2033 [Member]
Unsecured Senior Notes Due December 2033
Weighted Average PB-PIUs
Weighted Average PB-PIUs [Member]
Weighted Average PB-PIUs
Ownership [Domain]
Ownership [Domain]
Land
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost of Land
141 National Business Parkway
141 National Business Parkway [Member]
Represents the information pertaining to 141 National Business Parkway, an office property owned by the entity.
Accumulated amortization of deferred leasing costs
Deferred Costs, Leasing, Accumulated Amortization
2027
Finance Lease, Liability, to be Paid, Year Two
Schedule of Operating Leases Fixed Contractual Payments Due
Lessor, Operating Lease, Payment to be Received, Maturity [Table Text Block]
United States Government
United States Government [Member]
Represents the tenant, the United States Government.
140 National Business Parkway
140 National Business Parkway [Member]
Represents the information pertaining to 140 National Business Parkway, an office property owned by the entity.
Other
Other Services Revenue [Member]
Other Services Revenue [Member]
Customer [Domain]
Customer [Domain]
Entity Central Index Key
Entity Central Index Key
PEO Name
PEO Name
Exchange price per share (in dollars per share)
Debt Instrument, Convertible, Conversion Price
Schedule of Debt Maturities
Schedule of Maturities of Long-Term Debt [Table Text Block]
Total revenues
Revenues from real estate operations
Total revenues
Revenues
Revenues
Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year
Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year [Member]
Carrying amount and estimated fair value of debt
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equipment and personal property
Equipment and Personal Property [Member]
Represents the equipment and personal property, depreciable assets of the entity.
Schedule of Credit Risk Classification
Financing Receivable Credit Quality Indicators [Table Text Block]
Investing receivables payments received
Proceeds from Collection of Notes Receivable
Outstanding Aggregate Erroneous Compensation Amount
Outstanding Aggregate Erroneous Compensation Amount
Schedule of Segment Reporting Information, by Segment [Table]
Schedule of Segment Reporting Information, by Segment [Table]
Preferred distributions of annual operating cash flows to partner
Preferred Distributions of Annual Operating Cash Flows to Partner
Preferred Distributions of Annual Operating Cash Flows to Partner
Project EL
Project EL [Member]
Project EL
Schedule of Fair Value and Balance Sheet Classification of Interest Rate Derivatives
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block]
Extension option period
Debt Instrument, Extension Option, Term
Represents the period over which the debt may be extended at the option of the entity, subject to certain conditions.
7200 Redstone Gateway
7200 Redstone Gateway [Member]
Number 7200 Redstone Gateway [Member]
Construction contract and other service expenses paid
Construction Contract and Other Service Expenses Paid
Cash payments for costs related to construction and development services and other service operations during the current period.
Exercise Price
Award Exercise Price
Entity Filer Category
Entity Filer Category
Class of Stock [Domain]
Class of Stock [Domain]
Period after the cessation of major construction activities for considering property as partially operational if leases have commenced earlier (in years)
Period after Cessation of Major Construction Activities for Considering Property to be Partially Operational if Leases have Commenced Earlier
Represents the period after the cessation of major construction activities for considering property as partially operational if leases have commenced earlier.
Subsequent Event Type [Axis]
Subsequent Event Type [Axis]
7142 Columbia Gateway Drive
7142 Columbia Gateway Drive [Member]
Represents the information pertaining to 7142 Columbia Gateway Drive, an office property owned by the entity.
Transaction value
Disposal Group, Including Discontinued Operation, Consideration
Preferred Stock
Preferred Stock, Number of Shares, Par Value and Other Disclosure [Abstract]
Statement of Financial Position Location, Balance [Axis]
Statement of Financial Position Location, Balance [Axis]
Amortized cost basis
Total
Financing Receivable, before Allowance for Credit Loss
318 Sentinel Way
318 Sentinel Way [Member]
Represents the information pertaining to 318 Sentinel Drive, an office property owned by the entity.
Notes receivable, maximum initial maturity term
Financing Receivable, Maximum Initial Maturity Term
Financing Receivable, Maximum Initial Maturity Term
308 Sentinel Drive
308 Sentinel Drive [Member]
Represents the information pertaining to 308 Sentinel Drive, an office property owned by the entity.
Gross Carrying Amount
Finite-Lived Intangible Assets, Gross
Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year
Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year [Member]
Entity Address, Address Line One
Entity Address, Address Line One
Sentry Gateway - T
Sentry Gateway - T [Member]
Represents the information pertaining to 7700 Potranco Road, an office property owned by the entity.
Entity Address, Address Line Two
Entity Address, Address Line Two
Accumulated Other Comprehensive (Loss) Income
AOCI Attributable to Parent [Member]
B RE COPT DC JV II LLC
B RE COPT DC JV II LLC [Member]
B RE COPT DC JV II LLC
Deferred Leasing and Deferred Financing Costs
Deferred Charges, Policy [Policy Text Block]
Decrease in fair value of derivatives applied to accumulated other comprehensive loss/income and noncontrolling interests
Increase (Decrease) in Fair Value of Derivatives Applied to Aocl and Noncontrolling Interests
Increase in fair value of derivatives applied to Accumulated Other Comprehensive (Loss) Profit and noncontrolling interests
Investments [Domain]
Investments [Domain]
Contributions from noncontrolling interests in other consolidated entities
Minority Interest Increase From Contributions Including Joint Ventures
Minority Interest Increase From Contributions Including Joint Ventures
302 Sentinel Drive
302 Sentinel Drive [Member]
Represents the information pertaining to 302 Sentinel Drive, an office property owned by the entity.
Variable rate, additional spread
Debt Instrument, Additional Basis Spread on Variable Rate
Debt Instrument, Additional Basis Spread on Variable Rate
Internal Credit Assessment [Axis]
Internal Credit Assessment [Axis]
Redeemable noncontrolling interest
Redeemable Noncontrolling Interest, Equity, Carrying Amount
Internal Credit Assessment [Domain]
Internal Credit Assessment [Domain]
Ownership [Axis]
Ownership [Axis]
Interest Rate Derivatives
Derivative Instruments and Hedging Activities Disclosure [Text Block]
14280 Park Meadow Drive
14280 Park Meadow Drive [Member]
Represents the information pertaining to 14280 Park Meadow Drive, an office property owned by the entity.
7700 Advanced Gateway
7700 Advanced Gateway [Member]
7700 Advanced Gateway
6711 Columbia Gateway Drive
6711 Columbia Gateway Drive [Member]
Represents the information pertaining to 6711 Columbia Gateway Drive, an office property owned by the entity.
Beginning balance
Ending balance
Redeemable Noncontrolling Interest, Equity, Fair Value
Real Estate and Accumulated Depreciation, Name of Property [Domain]
Name of Property [Domain]
Other liabilities
Other Liabilities [Member]
Fair Value as of Grant Date
Award Grant Date Fair Value
Interest rate swap, effective April 1, 2020
Interest Rate Swap, Effective April 2020 0.573% [Member]
Interest Rate Swap, Effective April 2020 0.573% [Member]
Conversion of redeemable noncontrolling interests
Redeemable Noncontrolling Interest [Member]
Redeemable Noncontrolling Interest [Member]
Dilutive effect of share-based compensation awards (in shares)
Incremental Common Shares Attributable to Dilutive Effect of Share-Based Payment Arrangements
Granted (in shares or units)
Stock awards granted (in shares or units)
Number of Deferred Share Awards Granted (in shares)
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period
Impairments
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Write-down or Reserve, Amount
Title and Position [Domain]
Title and Position [Domain]
Interest rate derivatives
Interest Rate Derivative Assets, at Fair Value
Total operating expenses
Costs and Expenses
1100 Redstone Gateway
1100 Redstone Gateway [Member]
Number 1100 Redstone Gateway [Member]
Awards forfeited (in shares or units)
Forfeited (in shares or units)
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeited in Period
Unrecognized compensation cost
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount
7065 Columbia Gateway Drive
7065 Columbia Gateway Drive [Member]
Represents the information pertaining to 7065 Columbia Gateway Drive, an office property owned by the entity.
Long-term debt
Long-Term Debt, Fair Value
Changed Peer Group, Footnote
Changed Peer Group, Footnote [Text Block]
Counterparty Name [Domain]
Counterparty Name [Domain]
Schedule of Sales-Type Leases Fixed Contractual Payments Due
Sales-Type and Direct Financing Leases, Payment to be Received, Maturity [Table Text Block]
2027
Lessee, Operating Lease, Liability, to be Paid, Year Two
Adjustment To PEO Compensation, Footnote
Adjustment To PEO Compensation, Footnote [Text Block]
Minimum payout percentage if TSR is at least 6%
Share-Based Compensation Arrangement by Share-Based Payment Award, Minimum Payout Percentage If Total Shareholder Return Is At Least Six Percent
Share-Based Compensation Arrangement by Share-Based Payment Award, Minimum Payout Percentage If Total Shareholder Return Is At Least Six Percent
Acquisitions of operating properties and related intangible assets
Payments to Acquire Commercial Real Estate
Investment Type [Axis]
Investment Type [Axis]
Finance leases, lease liability, location
Finance Lease, Liability, Statement of Financial Position [Extensible Enumeration]
Title
Trading Arrangement, Individual Title
Peer Group Total Shareholder Return Amount
Peer Group Total Shareholder Return Amount
Phoenix, Arizona
Phoenix, Arizona [Member]
Phoenix, Arizona
Prepaid expenses and other assets, net
Prepaid Expense and Other Assets
Non-PEO NEO
Non-PEO NEO [Member]
Sales-type leases
Sales-Type and Direct Financing Leases, Payment to be Received, Fiscal Year Maturity [Abstract]
Canton Crossing Land
Canton Crossing Land [Member]
Represents the information pertaining to Canton Crossing Land, an office property owned by the entity.
Preferred return on capital contributions used to fund all other costs
Joint Venture, Preferred Return On Other Capital Contributions
Joint Venture, Preferred Return On Other Capital Contributions
Sale of Stock [Axis]
Sale of Stock [Axis]
4000 Market Street
4000 Market Street [Member]
Number 4000 Market Street [Member]
Land
Land, operating properties
Land [Member]
Number of compensation arrangements
Number of Compensation Arrangements
Number of Compensation Arrangements
Investing receivable allowance for credit loss
Allowance for credit losses
Beginning balance
Ending balance
Financing Receivable, Allowance for Credit Loss
Award Type [Domain]
Award Type [Domain]
2026
Lessee, Operating Lease, Liability, to be Paid, Year One
Adjustment to income attributable to share-based compensation awards for diluted EPS
Dilutive Securities, Effect on Basic Earnings Per Share, Options and Restrictive Stock Units
Noncontrolling interests in subsidiaries
Equity, Attributable to Noncontrolling Interest
Equity Awards Adjustments
Equity Awards Adjustments [Member]
Other
Other Noncash Income (Expense)
Unconsolidated Real Estate Joint Ventures Owning Operating Properties
Unconsolidated Real Estate Joint Ventures Owning Operating Properties [Member]
Unconsolidated Real Estate Joint Ventures Owning Operating Properties
Pension Benefits Adjustments, Footnote
Pension Benefits Adjustments, Footnote [Text Block]
Disaggregation of Revenue [Line Items]
Disaggregation of Revenue [Line Items]
Compensation Amount
Outstanding Recovery Compensation Amount
Subsegments [Domain]
Subsegments [Domain]
Schedule of Information Related to Investments in Consolidated Real Estate Joint Ventures
Consolidated Real Estate, Joint Ventures [Table Text Block]
Tabular disclosure of information pertaining to investments in consolidated real estate joint ventures.
Debt Instrument, Name [Domain]
Debt Instrument, Name [Domain]
Properties, Net
Real Estate Disclosure [Text Block]
Change in net deferred rent receivable and liability
Straight Line Rent
Recovery of Erroneously Awarded Compensation Disclosure [Line Items]
Portion of beginning balance recognized in revenue during the year
Contract with Customer, Liability, Revenue Recognized
Estimated Fair Value
Estimate of Fair Value Measurement [Member]
Basis point used in determining redemption price prior to maturity
Basis Point Used in Determining Redemption Price Prior to Maturity
Basis Point Used in Determining Redemption Price Prior to Maturity
MNPI Disclosure Timed for Compensation Value
MNPI Disclosure Timed for Compensation Value [Flag]
16543 Commerce Drive
16543 Commerce Drive [Member]
Represents the information pertaining to 16543 Commerce Drive, an office property owned by the entity.
Oak Grove D
Oak Grove D [Member]
Oak Grove D
Revenues
Revenues [Abstract]
Documents Incorporated by Reference
Documents Incorporated by Reference [Text Block]
Encumbrances
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Amount of Encumbrances
Finance leases - right-of-use assets, location
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]
Accumulated other comprehensive (loss) income
Accumulated Other Comprehensive Income (Loss), Net of Tax
2730 Hercules Road
2730 Hercules Road [Member]
Represents the information pertaining to 2730 Hercules Road, an office property owned by the entity.
2026
Long-Term Debt, Maturity, Year One
Financial Instruments [Domain]
Financial Instruments [Domain]
Number of properties sold
Number of Real Estate Properties Sold
Number of Real Estate Properties Sold
Number of lease properties which were provided environmental indemnifications
Property Subject to Environmental Indemnity, Number of Properties
Represents the number of properties in New Jersey which were provided environmental indemnifications by the entity.
2030
Long-Term Debt, Maturity, Year Five
Aggregate Pension Adjustments Service Cost
Aggregate Pension Adjustments Service Cost [Member]
1362 Mellon Road
1362 Mellon Road [Member]
Represents the information pertaining to 1362 Mellon Road, an office property owned by the entity.
Reclassification adjustments on interest rate derivatives recognized in interest expense
Amount of Income Reclassified from AOCI into Interest Expense on Statement of Operations
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, after Tax
Finite-Lived Intangible Assets by Major Class [Axis]
Finite-Lived Intangible Assets by Major Class [Axis]
2029
Sales-Type and Direct Financing Leases, Payment to be Received, Year Four
Minimum
Minimum
Minimum [Member]
Lackland Air Force Base
Lackland Air Force Base [Member]
Lackland Air Force Base [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Company Selected Measure Name
Company Selected Measure Name
Fair Value Measurement [Domain]
Fair Value Measurement [Domain]
Other property revenue
Other Property Revenue
Other Property Revenue
46591 Expedition Drive
46591 Expedition Drive [Member]
Represents the information pertaining to 46591 Expedition Drive, an office property owned by the entity.
1610 West Nursery Road
1610 West Nursery Road [Member]
Number 1610 West Nursery Road [Member]
TB- PIUs
Time-based Profit Interest Units [Member]
Time-based Profit Interest Units [Member]
Debt, Net
Debt Disclosure [Text Block]
Aggregate Available
Trading Arrangement, Securities Aggregate Available Amount
Operating cash flows for operating leases
Operating Lease, Payments
Percentage ownership in operating partnership
Limited Liability Company (LLC) or Limited Partnership (LP), Managing Member or General Partner, Ownership Interest
Stock Appreciation Rights (SARs)
Stock Appreciation Rights (SARs) [Member]
Dividends and distributions payable
Dividends/distributions payable
Dividends Payable
Numerator for diluted EPS on net income (loss) attributable to common shareholders
Net Income (Loss) Available to Common Stockholders, Diluted
23535 Cottonwood Parkway
23535 Cottonwood Parkway [Member]
Represents the information pertaining to 23535 Cottonwood Parkway, an office property owned by the entity.
Commitments and Contingencies
Commitments and Contingencies Disclosure [Text Block]
Denominator for diluted EPS (common shares) (in shares)
Weighted Average Number of Shares Outstanding, Diluted
Earned performance based awards payout granted on 50th percentile rank
Share-based Compensation Arrangement by Share-based Payment Award of Earned, Payout Percentage Based on Percentile Rank Equals to 50
Represents the earned payout, as a percentage of target, if the entity's total shareholder return relative to a peer group of companies ranks at the 50th percentile.
Conversion of common units to common shares (in shares)
Number of operating partnerships units converted into common shares (in units)
Stock Issued During Period, Shares, Conversion of Units
Non-GAAP Measure Description
Non-GAAP Measure Description [Text Block]
Reconciliation of Assets from Segment to Consolidated [Table]
Reconciliation of Assets from Segment to Consolidated [Table]
Derivative [Table]
Derivative [Table]
Entity Small Business
Entity Small Business
Limited partners' capital account, units outstanding (in shares)
Limited Partners' Capital Account, Units Outstanding
Net income attributable to noncontrolling interests
Net Income (Loss) Attributable to Redeemable Noncontrolling Interest
Real Estate Properties Status [Domain]
Real Estate Properties Status [Domain]
Represents the status of the property.
Document Transition Report
Document Transition Report
PSUs
Performance Share Units [Member]
Performance Share Units
1753 Pinnacle Drive
1753 Pinnacle Drive [Member]
Represents the information pertaining to 1753 Pinnacle Drive, an office property owned by the entity.
Total lease payments
Finance Lease, Liability, to be Paid
Underlying Securities
Award Underlying Securities Amount
Other debt repayments
Repayments of Other Long-Term Debt
Transfers from non-operating properties
Segment Reporting Transfers from Non Operating Properties
Represents amounts transferred from non operating properties to reported segments during the period resulting from properties being placed into service.
Equity Component [Domain]
Equity Component [Domain]
Document Period End Date
Document Period End Date
Tax Incremental Financing Bond
Tax Incremental Financing Bond [Member]
Tax Incremental Financing Bond [Member]
Total assets
Other Real Estate, Additions Gross
Other Real Estate, Additions Gross
Beginning balance
Ending balance
Accounts Receivable, Allowance for Credit Loss
870 Elkridge Landing Road
870 Elkridge Landing Road [Member]
Represents the information pertaining to 870 Elkridge Landing Road, an office property owned by the entity.
Awards Close in Time to MNPI Disclosures, Table
Awards Close in Time to MNPI Disclosures [Table Text Block]
Purchase price, net of purchase price credit
Asset Acquisition, Consideration Transferred, Excluding Transaction Costs, Net Of Purchase Price Credit
Asset Acquisition, Consideration Transferred, Excluding Transaction Costs, Net Of Purchase Price Credit
Sentry Gateway - Z
Sentry Gateway - Z [Member]
Represents the information pertaining to Sentry Gateway - Z, an office property owned by the entity.
1622 West Nursery Road
1622 West Nursery Road [Member]
Number 1622 West Nursery Road [Member]
Total equity
Balance
Balance
Equity, Including Portion Attributable to Noncontrolling Interest
Interest expense associated with amortization of debt discount and issuance costs
Amortization of Debt Discount (Premium)
Schedule of Deferred Shares Granted
Deferred Shares Granted [Table Text Block]
Deferred Shares Granted
Reclassification of redeemable noncontrolling interests to equity
Reclassification of Redeemable Noncontrolling Interests to Equity
Reclassification of Redeemable Noncontrolling Interests to Equity
Document Type
Document Type
Significant Unobservable Inputs (Level 3)
Fair Value, Inputs, Level 3 [Member]
Schedule of Reconciliation of Segment Assets to Total Assets
Reconciliation of Assets from Segment to Consolidated [Table Text Block]
Earnings Per Share ("EPS")
Earnings Per Share [Text Block]
Name
Outstanding Recovery, Individual Name
Loss Contingencies [Table]
Loss Contingencies [Table]
Additional paid-in capital
Additional Paid in Capital
Product and Service [Axis]
Product and Service [Axis]
Asset Acquisition [Domain]
Asset Acquisition [Domain]
7600 Advanced Gateway
7600 Advanced Gateway [Member]
7600 Advanced Gateway [Member]
Prepaid expenses and other assets, net
Prepaid Expenses and Other Assets, Net [Member]
Prepaid Expenses and Other Assets, Net [Member]
Revenue from Contract with Customer Benchmark
Revenue from Contract with Customer Benchmark [Member]
Property leases - variable
Variable Lease, Cost
Income Tax Disclosure [Line Items]
Income Tax Disclosure [Table] [Line Items]
[Line Items] for Income Tax Disclosure [Table]
Construction contract and other service revenues
Construction contract and other service revenues
Revenue from Contract with Customer, Excluding Assessed Tax
Less: Amount representing interest
Sales-type and Direct Financing Leases, Lease Receivable, Undiscounted Excess Amount
NoVA Defense/IT
NoVA Defense/IT [Member]
NoVA Defense/IT
Total acquisition cost
Asset Acquisition, Consideration Transferred
Intangible assets on real estate acquisitions
Finite-Lived Intangible Assets Acquired
Statistical Measurement [Axis]
Statistical Measurement [Axis]
Variable
Operating Lease, Variable Lease Income
Investing receivables funded
Payments to Acquire Notes Receivable
2100 L Street
2100 L Street [Member]
Number 2100 L Street [Member]
Fixed Rate
Derivative, Fixed Interest Rate
Aggregate Erroneous Compensation Amount
Aggregate Erroneous Compensation Amount
Disposal Group Name [Axis]
Disposal Group Name [Axis]
Other
Other [Member]
Other
5801 University Research Court
5801 University Research Court [Member]
Number 5801 University Research Court [Member]
1340 Ashton Road
1340 Ashton Road [Member]
Represents the information pertaining to 1340 Ashton Road, an office property owned by the entity.
PB PIU Grants 2024
PB PIU Grants 2024 [Member]
PB PIU Grants 2024
Peer Group Issuers, Footnote
Peer Group Issuers, Footnote [Text Block]
Numerator for basic EPS on net income (loss) attributable to common shareholders
Net Income (Loss) Available to Common Stockholders, Basic
Percentage of cumulative preferred returns of cash flows on our invested capital
Percentage of Cumulative Preferred Returns of Cash Flows on Entity Invested Capital
Percentage of Cumulative Preferred Returns of Cash Flows on Entity Invested Capital
7100 Redstone Gateway
7100 Redstone Gateway [Member]
7100 Redstone Gateway
Deferred Share Awards
Deferred Share Awards [Member]
Deferred Share Awards [Member]
Performance Based Grants 2025
Performance Based Grants 2025 [Member]
Performance Based Grants 2025
Schedule of Reconciliation of NOI from Real Estate Operations and Service Operations to Net Income
Reconciliation of Operating Profit (Loss) from Segments to Consolidated [Table Text Block]
Schedule of Effect of Interest Rate Derivatives on Consolidated Statements of Operations and Comprehensive Income
Derivative Instruments, Gain (Loss) [Table Text Block]
Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Inputs, Level 1 [Member]
Gain on sales of real estate
Gain on disposal
Gain (Loss) on Disposition of Assets
Share-Based Compensation
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
131 National Business Parkway
131 National Business Parkway [Member]
Represents the information pertaining to 131 National Business Parkway, an office property owned by the entity.
Investments in real estate joint ventures
Real Estate Joint Venture [Line Items]
Net income (loss) attributable to common shareholders - diluted (in dollars per share)
Diluted EPS attributable to common shareholders (in dollars per share)
Earnings Per Share, Diluted
2022 ATM Program
Two Thousand Twenty Two Common Stock At-the-Market Program [Member]
Two Thousand Twenty Two Common Stock At-the-Market Program
2030
Lessor, Operating Lease, Payment to be Received, Year Five
Supplemental schedule of non-cash investing and financing activities
Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract]
2711 Technology Drive
2711 Technology Drive [Member]
Represents the information pertaining to 2711 Technology Drive, an office property owned by the entity.
Fort Meade/BW Corridor
Fort Meade and Baltimore Washington Corridor [Member]
Fort Meade and Baltimore Washington Corridor [Member]
Sales-type lease costs paid
Payments for Sales-Type Lease Costs
Payments for Sales-Type Lease Costs
Shares issued to the public (in shares)
Sale of Stock, Number of Shares Issued in Transaction
Fixed-rate mortgage debt
Fixed rate mortgage loans
Fixed Rate Secured Debt [Member]
A collateralized debt obligation (backed by pledge, mortgage or other lien on the entity's assets) bearing fixed interest rates.
Number of forms of share-based compensation
Share-based Compensation Arrangement by Share-based Payment Award, Number of Forms of Share-Based Compensation
Share-based Compensation Arrangement by Share-based Payment Award, Number of Forms of Share-Based Compensation
Real Estate and Accumulated Depreciation
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Consolidation Items [Domain]
Consolidation Items [Domain]
Weighted Average Vested PIUs
Weighted Average Vested PIUs [Member]
Weighted Average Vested PIUs
Scheduled principal amortization
Scheduled Principal Amortization Repayments of Long-term Debt
The cash outflow for scheduled principal amortization payments made on debt initially having maturity due after one year or beyond the normal operating cycle, if longer.
Auditor Location
Auditor Location
420 National Business Parkway
420 National Business Parkway [Member]
Number 420 National Business Parkway [Member]
Asset Acquisition [Table]
Asset Acquisition [Table]
Effective interest rate
Note Receivable, Terms, Effective Interest Rate
Note Receivable, Terms, Effective Interest Rate
Huntsville, Alabama
Huntsville, Alabama [Member]
Huntsville, Alabama [Member]
Noncontrolling Interest [Abstract]
Noncontrolling Interest [Abstract]
Less: Amount representing interest
Lessee, Operating Lease, Liability, Undiscounted Excess Amount
Investments in consolidated real estate joint ventures
Consolidated Joint Ventures Disclosure [Abstract]
Consolidated Joint Ventures Disclosure
Total
Long-Term Debt, Gross
Entity Well-known Seasoned Issuer
Entity Well-known Seasoned Issuer
4100 Market Street
4100 Market Street [Member]
Number 4100 Market Street [Member]
Total lease payments
Lessee, Operating Lease, Liability, to be Paid
6200 Redstone Gateway
6200 Redstone Gateway [Member]
6200 Redstone Gateway
Number of impaired operating properties
Number Of Impaired Operating Real Estate Properties
Number Of Impaired Operating Real Estate Properties
16442 Commerce Drive
16442 Commerce Drive [Member]
Represents the information pertaining to 16442 Commerce Drive, an office property owned by the entity.
Distributions to noncontrolling interests
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders
Current borrowing capacity
Line of Credit Facility, Current Borrowing Capacity
Schedule of Lease Revenue Recognized Between Fixed and Variable Lease Revenue
Operating Lease, Lease Income [Table Text Block]
Expiration Date
Trading Arrangement Expiration Date
Other Commitments [Domain]
Other Commitments [Domain]
Nominal Ownership %
Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage
Acquisitions 2024
Acquisitions 2024 [Member]
Acquisitions 2024
Accumulated Depreciation
Beginning balance
Ending balance
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation
Equity
Equity, Including Portion Attributable to Noncontrolling Interest [Abstract]
300 Secured Gateway
300 Secured Gateway [Member]
300 Secured Gateway
Sales
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Cost of Investment in Real Estate Sold
Schedule of Information Related to Investments in Unconsolidated Real Estate Joint Ventures
Equity Method Investments [Table Text Block]
PS B
Parkstone B [Member]
Parkstone B
Awards granted, percentage of target awards
Share-Based Compensation Arrangement by Share-Based Payment Award, Granted, Percentage Of Target
Share-Based Compensation Arrangement by Share-Based Payment Award, Granted, Percentage Of Target
Compensation Actually Paid vs. Net Income
Compensation Actually Paid vs. Net Income [Text Block]
(Increase) decrease in accounts receivable
Increase (Decrease) in Accounts Receivable
6740 Alexander Bell Drive
6740 Alexander Bell Drive [Member]
Represents the information pertaining to 6740 Alexander Bell Drive, an office property owned by the entity.
Lease incentives, net
Incentive to Lessee
Entity Current Reporting Status
Entity Current Reporting Status
Receivables [Abstract]
Receivables [Abstract]
Fair values of interest rate swap derivatives
Derivative [Line Items]
1616 West Nursery Road
1616 West Nursery Road [Member]
Number 1616 West Nursery Road [Member]
Awards Close in Time to MNPI Disclosures
Awards Close in Time to MNPI Disclosures [Table]
Repayments of debt
Repayments of Long-Term Debt [Abstract]
Consolidated Entities [Domain]
Consolidated Entities [Domain]
7205 Riverwood Drive
7205 Riverwood Drive [Member]
Represents the information pertaining to 7160 Riverwood Drive, an office property owned by the entity.
Financial Instrument [Axis]
Financial Instrument [Axis]
Adjustments to reconcile net income (loss) to net cash provided by operating activities
Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity, Noncash Item [Abstract]
Statement of Financial Position [Abstract]
Statement of Financial Position [Abstract]
Executive Category:
Executive Category [Axis]
7272 Park Circle Drive
7272 Park Circle Drive [Member]
Represents the information pertaining to 7272 Park Circle Drive, an office property owned by the entity.
Repayments of debt
Repayments of Debt
Weighted average borrowings
Line of Credit Facility, Average Outstanding Amount
Current Fiscal Year End Date
Current Fiscal Year End Date
100 Secured Gateway
100 Secured Gateway [Member]
100 Secured Gateway [Member]
Earned performance based awards payout granted on 75th or greater percentile rank
Share-based Compensation Arrangement by Share-based Payment Award of Earned, Payout Percentage Based on Percentile Rank Greater than or Equals to 75
Represents the earned payout, as a percentage of target, if the entity's total shareholder return relative to a peer group of companies ranks at the 75th percentile or greater.
PS A
Parkstone A [Member]
Parkstone A
Finite-Lived Intangible Assets, Major Class Name [Domain]
Finite-Lived Intangible Assets, Major Class Name [Domain]
Number of extensions
Debt Instrument, Number Of Extensions
Debt Instrument, Number Of Extensions
Baseline Common Share Value (in dollars per share)
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Baseline Common Share Value
Represents the baseline common share value that is used in valuing the grant date fair value of awards.
Schedule of Investing Receivables
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]
(Decrease) increase in rents received in advance and security deposits
Increase (Decrease) in Advance Rent and Security Deposit Liability
The net change in amount that has been received by the entity that represents collections of cash or other assets related to real estate operations revenue for which revenue has not yet been recognized and security deposits.
Weighted Average Grant Date Fair Value
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Other consolidated entities
Other Noncontrolling Interests
2021
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year
Cumulative distributions in excess of net income
Accumulated Distributions in Excess of Net Income
Equity Awards Adjustments, Excluding Value Reported in Compensation Table
Equity Awards Adjustments, Excluding Value Reported in the Compensation Table [Member]
22299 Exploration Drive
22299 Exploration Drive [Member]
Represents the information pertaining to 22299 Exploration Drive, an office property owned by the entity.
LW Redstone Company, LLC
LW Redstone Company LLC [Member]
Represents the investment in L W Redstone Company, LLC, a consolidated joint venture.
Redeemable Noncontrolling Interests
Noncontrolling Interest Disclosure [Text Block]
Lessor, Lease, Description [Line Items]
Lessor, Lease, Description [Line Items]
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
Lease incentives paid
Payments of Lease Incentives
Payments of Lease Incentives
Proceeds from debt
Proceeds from Issuance of Long-Term Debt [Abstract]
7400 Redstone Gateway
7400 Redstone Gateway [Member]
Number 7400 Redstone Gateway [Member]
Weighted average antidilutive securities excluded from computation of diluted earnings per share (in shares)
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount
Denominator (all weighted averages)
Weighted Average Number of Shares Outstanding, Diluted [Abstract]
Fair Value, by Balance Sheet Grouping [Table]
Fair Value, by Balance Sheet Grouping [Table]
2027
Long-Term Debt, Maturity, Year Two
Leases
Lessee, Operating Leases [Text Block]
6841 Benjamin Franklin Drive
6841 Benjamin Franklin Drive [Member]
6841 Benjamin Franklin Drive
Net cash provided by (used in) financing activities
Cash Provided by (Used in) Financing Activity, Including Discontinued Operation
Measure:
Measure [Axis]
Net credit loss expense (recoveries)
Financing Receivable, Credit Loss, Expense (Reversal)
Summary of Significant Accounting Policies
Basis of Presentation and Significant Accounting Policies [Text Block]
Data Center Shells
Data Center Shells [Member]
Data Center Shells [Member]
Property, Plant and Equipment, Type [Domain]
Long-Lived Tangible Asset [Domain]
Deferred rent receivable
Deferred Rent Receivables, Net
Disposal Group Classification [Domain]
Disposal Group Classification [Domain]
Schedule III-Real Estate and Accumulated Depreciation
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation Disclosure [Text Block]
1560 West Nursery Road
1560 West Nursery Road [Member]
Number 1560 West Nursery Road [Member]
Defense/IT Portfolio
Defense/IT Portfolio [Member]
Defense/IT Portfolio
Pay vs Performance Disclosure, Table
Pay vs Performance [Table Text Block]
Gross Amounts Carried At Close of Period
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Forgone Recovery due to Violation of Home Country Law, Amount
Forgone Recovery due to Violation of Home Country Law, Amount
Risk-free Interest Rate
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Risk Free Interest Rate
Entity Tax Identification Number
Entity Tax Identification Number
891 Elkridge Landing Road
891 Elkridge Landing Road [Member]
Represents the information pertaining to 891 Elkridge Landing Road, an office property owned by the entity.
Asset Acquisition [Axis]
Asset Acquisition [Axis]
8600 Advanced Gateway
8600 Advanced Gateway [Member]
8600 Advanced Gateway [Member]
Number of real estate properties
Number of Properties
Number of Real Estate Properties
22300 Exploration Drive
22300 Exploration Drive [Member]
Represents the information pertaining to 22230 Exploration Drive, an office property owned by the entity.
Common shares of beneficial interest, shares issued (in shares)
Common Stock, Shares, Issued
2029
Long-Term Debt, Maturity, Year Four
Operating leases, weighted average remaining lease term
Operating Lease, Weighted Average Remaining Lease Term
Schedule of Activity for Redeemable Noncontrolling Interest
Redeemable Noncontrolling Interest [Table Text Block]
6716 Alexander Bell Drive
6716 Alexander Bell Drive [Member]
Represents the information pertaining to 6716 Alexander Bell Drive, an office property owned by the entity.
Entity Public Float
Entity Public Float
Interest expense
Interest expense
Interest Expense, Nonoperating
Trading Arrangement:
Trading Arrangement [Axis]
Total Shareholder Return Amount
Total Shareholder Return Amount
Lease revenue
Lease revenue
Operating Lease, Lease Income
Commitments and Contingencies
Loss Contingencies [Line Items]
Real Estate, Type of Property [Axis]
Real Estate, Type of Property [Axis]
Construction contract and other service expenses
Construction contract and other service expenses
Construction Contract And Other Service Expenses
Construction Contract And Other Service Expenses
Service operations
Other assets
Segment Reporting, Reconciling Item, Corporate Nonsegment [Member]
Security Exchange Name
Security Exchange Name
Schedule of Reconciliation of Segment Revenues to Total Revenues
Reconciliation of Revenue from Segments to Consolidated [Table Text Block]
Acquisitions 2025
Acquisitions 2025 [Member]
Acquisitions 2025
Audit Information [Abstract]
Audit Information
2027
Lessor, Operating Lease, Payment to be Received, Year Two
Baltimore, Maryland
Baltimore, Maryland [Member]
Baltimore, Maryland [Member]
Other investing loans receivable
Other investing loans receivable
Other Investing Loans Receivables [Member]
Other Investing Loans Receivables [Member]
Investing Receivables
Financing Receivables [Text Block]
Maximum borrowing capacity
Line of Credit Facility, Maximum Borrowing Capacity
911 Elkridge Landing Road
911 Elkridge Landing Road [Member]
Represents the information pertaining to 911 Elkridge Landing Road, an office property owned by the entity.
15050 Conference Center Drive
15050 Conference Center Drive [Member]
15050 Conference Center Drive
Change in Accounts Receivable
Change in Accounts Receivable [Abstract]
Change in Accounts Receivable
Share-based compensation issuance, net of redemptions
Shares Granted, Value, Share-Based Payment Arrangement, after Forfeiture
Credit Losses, Financial Assets and Other Instruments [Line Items]
Credit Losses, Financial Assets and Other Instruments [Line Items]
Credit Losses, Financial Assets and Other Instruments
Statement [Line Items]
Statement [Line Items]
Rule 10b5-1 Arrangement Adopted
Rule 10b5-1 Arrangement Adopted [Flag]
Schedule of Amortization of Intangible Assets and Deferred Revenue
Intangible Assets and Deferred Revenue on Real Estate Acquisitions [Table Text Block]
Tabular disclosure of amortization periods of intangible assets and deferred revenue, by major class.
Cash and cash equivalents
Cash and cash equivalents at beginning of year
Cash and cash equivalents at end of year
Cash and Cash Equivalent
Projects in development or held for future development
Development in Process
Unconsolidated Real Estate Joint Ventures
Unconsolidated Real Estate Joint Ventures [Member]
Unconsolidated Real Estate Joint Ventures [Member]
Common Shares
Common Shares
Common Stock [Member]
Vested (in shares or units)
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period
Schedule of Property Right-of-Use Assets and Lease Liabilities
Right-of-Use Assets and Lease Liabilities [Table Text Block]
Right-of-Use Assets and Lease Liabilities [Table Text Block]
Intangible Assets and Deferred Revenue on Property Acquisitions
Goodwill and Intangible Assets, Intangible Assets, Policy [Policy Text Block]
Finance Leases
Finance Lease, Liability, to be Paid, Fiscal Year Maturity [Abstract]
Less: Accumulated depreciation
Real Estate Investment Property, Accumulated Depreciation
Net increase (decrease) in cash and cash equivalents and restricted cash
Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation
Accrued interest receivable, location
Financing Receivable, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration]
6731 Columbia Gateway Drive
6731 Columbia Gateway Drive [Member]
Represents the information pertaining to 6731 Columbia Gateway Drive, an office property owned by the entity.
Sentry Gateway - V
Sentry Gateway -V [Member]
Represents the information pertaining to Sentry Gateway -V, an office property owned by the entity.
560 National Business Parkway
560 National Business Parkway [Member]
560 National Business Parkway
7000 Redstone Gateway
7000 Redstone Gateway [Member]
7000 Redstone Gateway
Statistical Measurement [Domain]
Statistical Measurement [Domain]
Thereafter
Lessee, Operating Lease, Liability, to be Paid, after Year Five
Renewal term
Lessor, Operating Lease, Renewal Term
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]
Real Estate [Domain]
Real Estate [Domain]
8621 Robert Fulton Drive
8621 Robert Fulton Drive [Member]
Represents the information pertaining to 8621 Robert Fulton Drive, an office property owned by the entity.
Interest rate swaps
Interest Rate Swap [Member]
Deferred financing costs paid
Payments of Financing Costs
Infrastructure costs funded to date for reimbursement by the City of Huntsville
Infrastructure Costs Funded to Date by Entity for Reimbursement
Infrastructure Costs Funded to Date by Entity for Reimbursement
Impairment of Properties
Impairment or Disposal of Long-Lived Assets, Policy [Policy Text Block]
Equity in income (loss) of unconsolidated entities
Equity in income (loss) of unconsolidated entities
Equity in income (loss) of unconsolidated entities
Income (Loss) from Equity Method Investments
Leases [Abstract]
Leases [Abstract]
2024
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year
Sale of Properties
Sale of Interest In Properties [Policy Text Block]
Sale of Interest In Properties [Policy Text Block]
2029
Lessor, Operating Lease, Payment to be Received, Year Four
Schedule of Characterization of Dividends Declared on Common and Preferred shares
Dividends Declared [Table Text Block]
Patriot Ridge
Patriot Ridge [Member]
Represents the information pertaining to Patriot Ridge, an office property owned by the entity.
Operating Activities [Axis]
Operating Activities [Axis]
Real Estate Property Classification [Domain]
Real Estate Property Classification [Domain]
Represents classification of real estate properties.
Land
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Land, Amount
Pledged Status [Axis]
Pledged Status [Axis]
Trading Arrangements, by Individual
Trading Arrangements, by Individual [Table]
Net income (loss) attributable to common shareholders - basic (in dollars per share)
Basic EPS attributable to common shareholders (in dollars per share)
Earnings Per Share, Basic
1751 Pinnacle Drive
1751 Pinnacle Drive [Member]
Represents the information pertaining to 1751 Pinnacle Drive, an office property owned by the entity.
Construction contract revenue
Construction Contract Revenue [Member]
Construction Contract Revenue [Member]
1501 South Clinton Street
1501 South Clinton Street [Member]
Represents the information pertaining to 1501 South Clinton Street, an office property owned by the entity.
Liabilities
Liabilities, Fair Value Disclosure [Abstract]
610 Guardian Way
610 Guardian Way [Member]
610 Guardian Way
Interest rate swap, effective August 1, 2019
Interest Rate Swap, Effective August 2019 1.678% [Member]
Interest Rate Swap, Effective August 1, 2019 [Member]
Total other comprehensive loss
Other Comprehensive Income (Loss), Net of Tax
Lease Revenue From Continuing Operations, Risk Benchmark
Lease Revenue From Continuing Operations, Risk Benchmark [Member]
Lease Revenue, Risk Benchmark [Member]
Schedule of Segment Financial Information for Reportable Segments
Schedule of Segment Reporting Information, by Segment [Table Text Block]
Common units in COPT Defense Properties, L.P. (“CDPLP”)
Noncontrolling Interest in Operating Partnerships
Additional information
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, and Accumulated Depreciation, Other Disclosure [Abstract]
Threshold percentage of stock price trigger
Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger
General, administrative, leasing and other expenses paid
General and Administrative, Leasing, and Other Expenses Paid
General and Administrative, Leasing, and Other Expenses Paid
Arundel Preserve
Arundel Preserve [Member]
Represents the information pertaining to Arundel Preserve, an office property owned by the entity.
Revenue, allocated to remaining performance obligations
Revenue, Remaining Performance Obligation, Amount
8800 Redstone Gateway
8800 Redstone Gateway [Member]
Number 8800 Redstone Gateway [Member]
2028
Finance Lease, Liability, to be Paid, Year Three
Other Developments, including intercompany eliminations
Other Developments Including Intercompany Eliminations [Member]
Represents the information pertaining to other developments including intercompany eliminations, various types of properties owned by the entity.
Award Timing MNPI Disclosure
Award Timing MNPI Disclosure [Text Block]
7061 Columbia Gateway Drive
7061 Columbia Gateway Drive [Member]
Represents the information pertaining to 7061 Columbia Gateway Drive, an office property owned by the entity.
Variable Interest Entity, Primary Beneficiary
Variable Interest Entity, Primary Beneficiary [Member]
Accounts and Financing Receivables [Table]
Accounts and Financing Receivables [Table]
8500 Advanced Gateway
8500 Advanced Gateway [Member]
8500 Advanced Gateway
Share-based compensation cost
Share-Based Payment Arrangement, Expense
Reconciliation of segment assets to total assets
Segment Reporting, Asset Reconciling Item [Line Items]
Hedging Designation [Domain]
Hedging Designation [Domain]
Accrued interest receivable, net of allowance for credit losses
Financing Receivable, Accrued Interest, after Allowance for Credit Loss
Properties in development or held for future development
Payments to Develop Real Estate Assets
Percent of award distribution rights
Share-based Compensation Arrangement by Share-based Payment Award, Distribution Rights as a Percentage of Non-PIU Common Units, Percentage
Share-based Compensation Arrangement by Share-based Payment Award, Distribution Rights as a Percentage of Non-PIU Common Units, Percentage
Total liabilities, redeemable noncontrolling interest and equity
Liabilities and Equity
Antidilutive securities
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Concentration Risk Benchmark [Axis]
Concentration Risk Benchmark [Axis]
Stevens Investors, LLC
Stevens Investors, LLC
Stevens Investors, LLC [Member]
Stevens Investors, LLC [Member]
Net discounts and deferred financing costs
Debt Instrument, Unamortized Discount (Premium) and Deferred Financing Costs, Net
Debt Instrument, Unamortized Discount (Premium) and Deferred Financing Costs, Net
Greater Washington, DC/Baltimore
Greater Washington, DC/Baltimore [Member]
Greater Washington, DC/Baltimore
Threshold consecutive trading days
Debt Instrument, Convertible, Threshold Consecutive Trading Days
7160 Riverwood Drive
7160 Riverwood Drive [Member]
Represents the information pertaining to 7160 Riverwood Drive, an office property owned by the entity.
General, administrative, leasing and other expenses
General and Administrative Expense [Member]
Equity Method Investment [Table]
Equity Method Investment [Table]
Lease liabilities
Lease Liabilities [Abstract]
Lease Liabilities
133 National Business Parkway
133 National Business Parkway [Member]
Represents the information pertaining to 133 National Business Parkway, an office property owned by the entity.
Additions to long-lived assets
Segment, Expenditure, Addition to Long-Lived Assets
PSU Grants 2023
PSU Grants 2023 [Member]
PSU Grants 2023
Accounting Policies [Abstract]
Accounting Policies [Abstract]
Below-market leases
Below Market Lease, Acquired
Schedule of Property Operating Lease, Liability, Maturity
Lessee, Operating Lease, Liability, to be Paid, Maturity [Table Text Block]
Concentration Risk Type [Domain]
Concentration Risk Type [Domain]
Revolving Development Facility
Repayments of Secured Debt
324 Sentinel Way
324 Sentinel Way [Member]
Represents the information pertaining to 324 Sentinel Drive, an office property owned by the entity.
13450 Sunrise Valley Drive
13450 Sunrise Valley Drive [Member]
Represents the information pertaining to 13450 Sunrise Valley Drive, an office property owned by the entity.
Finance lease cost
Finance Lease Cost [Abstract]
Finance Lease Cost
Tenant Notes Receivable
Tenant notes receivable
Tenant Notes Receivables [Member]
Tenant Notes Receivables [Member]
Pay vs Performance Disclosure [Line Items]
Property - operating lease liabilities
Operating leases - Property
Lease liability
Operating Lease, Liability
410 National Business Parkway
410 National Business Parkway [Member]
Represents the information pertaining to 410 National Business Parkway, an office property owned by the entity.
Total contractual payments
Lessor, Operating Lease, Payment to be Received
Liabilities
Liabilities [Abstract]
Lessee, number of lease contracts
Lessee, Number Of Lease Contracts
Lessee, Number Of Lease Contracts
Depreciation and amortization associated with real estate operations
Depreciation and other amortization associated with real estate operations
Depreciation, Depletion and Amortization, Nonproduction
Amortization of property right-of-use assets
Finance Lease, Right-of-Use Asset, Amortization
Weighted average interest rate
Long-Term Debt, Weighted Average Interest Rate, over Time
Other dispositions
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Other Deduction
Difference between the joint venture's lower cost basis and the entity's share of underlying equity in the net assets
Equity Method Investment, Difference Between Carrying Amount and Underlying Equity
Changes in cost of properties
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Number of years following construction commencement threshold achievement before partner's interest can be purchased at fair value
Number of Years Following Construction Commencement Threshold Achievement Before Partner's Interest Can Be Purchased At Fair Value
Number of years following construction commencement threshold achievement before partner's interest can be purchased at fair value
Variable Interest Entity [Table]
Variable Interest Entity [Table]
Statement of Cash Flows [Abstract]
Statement of Cash Flows [Abstract]
Company Selected Measure Amount
Company Selected Measure Amount
Earned performance based awards payout granted on percentile rank below 25th
Share-based Compensation Arrangement by Share-based Payment Award of Earned, Payout Percentage Based on Percentile Rank Less than 25
Represents the earned payout percentage based on percentile rank below 25.
2028
Lessee, Operating Lease, Liability, to be Paid, Year Three
Comprehensive income (loss) attributable to common shareholders
Comprehensive Income (Loss), Net of Tax, Attributable to Parent
Disposal Group Name [Domain]
Disposal Group Name [Domain]
Name
Measure Name
938 Elkridge Landing Road
938 Elkridge Landing Road [Member]
Represents the information pertaining to 938 Elkridge Landing Road, an office property owned by the entity.
Mortgage Debt
Mortgage and other secured debt
Secured Debt
Secured Debt [Member]
Redeemable Noncontrolling Interest [Roll Forward]
Equity, Attributable to Noncontrolling Interest [Roll Forward]
Class of Stock [Line Items]
Class of Stock [Line Items]
Notional amount of interest rate derivatives after scheduled amortization
Interest Rate Cash Flow Hedge, Derivative Notional Amount after Scheduled Amortization
Represents the notional amount of interest rate derivatives after scheduled amortization.
Term Loan Facility
Unsecured Debt [Member]
14840 Conference Center Drive
14840 Conference Center Drive [Member]
Represents the information pertaining to 14840 Conference Center Drive, an office property owned by the entity.
Debt, net
Carrying Value
Debt, net
Long-Term Debt
Legal Entity [Axis]
Legal Entity [Axis]
Total assets
Total Assets
Assets
Total consolidated assets
Assets
44425 Pecan Court
44425 Pecan Court [Member]
Represents the information pertaining to 44425 Pecan Court, an office property owned by the entity.
Sales-type lease receivable
Sales-Type Lease Receivables [Member]
Sales-Type Lease Receivables
1220 12th Street, SE
1220 12th Street Se [Member]
Represents the information pertaining to 1220 12th Street, SE, an office property owned by the entity.
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Credit Quality Indicator [Line Items]
Vested (in dollars per share or unit)
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value
Real Estate [Table]
Real Estate [Table]
Geographical [Domain]
Geographical [Domain]
Period used recovery analysis for long-lived assets to be held and used that may be impaired (in years)
Period used recovery analysis for Potentially Impaired Long Lived Asset Held and Used
Period used for recovery analysis of long lived assets to be held and used that may be impaired.
Income Taxes
Income Tax, Policy [Policy Text Block]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Cash flows from operating activities
Cash Provided by (Used in) Operating Activity, Including Discontinued Operation [Abstract]
Receivable Type [Axis]
Receivable Type [Axis]
Total other segment items
Segment Reporting, Other Segment Item, Amount
Weighted average amortization period
Weighted Average Amortization Period (in Years)
Acquired Finite-Lived Intangible Assets, Weighted Average Useful Life
Depreciation expense
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation, Depreciation Expense
Concentration Risk Type [Axis]
Concentration Risk Type [Axis]
Other segment items
Segment, Reconciliation of Other Items from Segments to Consolidated [Abstract]
Reconciliation of cash and cash equivalents and restricted cash
Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Including Discontinued Operation [Abstract]
7175 Riverwood Drive
7175 Riverwood Drive [Member]
Represents the information pertaining to 7175 Riverwood Drive, an office property owned by the entity.
Assets:
Assets, Fair Value Disclosure [Abstract]
Dividends declared per common share (in dollars per share)
Common Stock, Dividends, Per Share, Declared
2026
Finance Lease, Liability, to be Paid, Year One
Entity Common Stock, Shares Outstanding
Entity Common Stock, Shares Outstanding
Deferred incremental costs
Capitalized Contract Cost, Net
Recognition of operating lease right-of-use assets and related lease liabilities
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability
Significant Other Observable Inputs(Level 2)
Fair Value, Inputs, Level 2 [Member]
Document Financial Statement Error Correction
Document Financial Statement Error Correction [Flag]
Carrying Value of Investment
Carrying values of investments in UJVs owning operating properties, net of deficit investment balances
Investment in UJV deficit balance included in segment assets
Equity Method Investments
Insider Trading Policies and Procedures Not Adopted
Insider Trading Policies and Procedures Not Adopted [Text Block]
Operating Leases
Lessee, Operating Lease, Liability, to be Paid, Fiscal Year Maturity [Abstract]
2.25%, $400,000 aggregate principal
Unsecured Senior Notes Due March 2026 [Member]
Unsecured Senior Notes Due March 2026
Encumbered Assets
Asset Pledged as Collateral [Member]
Purchase price
Asset Acquisition, Consideration Transferred, Excluding Transaction Costs
Asset Acquisition, Consideration Transferred, Excluding Transaction Costs
Above-market leases
Above-market leases
Leases, Acquired-in-Place, Market Adjustment [Member]
Plan Name [Axis]
Plan Name [Axis]
Properties
Property, Plant and Equipment, Policy [Policy Text Block]
2030
Sales-Type and Direct Financing Leases, Payment to be Received, Year Five
PEO
PEO [Member]
PB PIU Grants 2025
PB PIU Grants 2025 [Member]
PB PIU Grants 2025
2017 Omnibus Equity and Incentive Plan
Two Thousand and Seventeen Omnibus Equity and Incentive Plan [Member]
Two Thousand and Seventeen Omnibus Equity and Incentive Plan [Member]
Revolving Development Facility
Proceeds from Issuance of Secured Debt
NoVA Office A
NOVA Office A [Member]
NOVA Office A [Member]
16501 Commerce Drive
16501 Commerce Drive [Member]
Represents the information pertaining to 16501 Commerce Drive, an office property owned by the entity.
Income (loss) before equity in income (loss) of unconsolidated entities and income taxes
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest
Changes in operating assets and liabilities
Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity, Increase (Decrease) in Operating Capital [Abstract]
In-place lease value
In-place lease value
In Place Lease Value [Member]
Represents In-place lease value, which is based on the present value of additional income to be realized as a result of leases being in place on the acquired properties and costs to execute similar leases.
Land improvements
Land Improvements [Member]
Expected Volatility of Common Shares
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Volatility Rate
8200 Rideout Road
8200 Rideout Road [Member]
8200 Rideout Road
8100 Rideout Road
8100 Rideout Road [Member]
8100 Rideout Road
6000 Redstone Gateway
6000 Redstone Gateway [Member]
6000 Redstone Gateway [Member]
Share-based Payment Arrangement [Abstract]
Share-Based Payment Arrangement [Abstract]
Increase in lease incentives and prepaid expenses and other assets, net
Increase (Decrease) in Lease Incentives and Prepaid Expenses and Other Assets, Net
Increase (Decrease) in Lease Incentives and Prepaid Expenses and Other Assets, Net
Cash and cash equivalents and restricted cash at beginning of year
Cash and cash equivalents and restricted cash at end of year
Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation
Income Statement [Abstract]
Income Statement [Abstract]
Potential earned payout for defined levels of performance under awards
Share-based Compensation Arrangement by Share-based Payment Award, Earned Performance Share Units, Payout Percentage [Abstract]
Sale of Stock [Domain]
Sale of Stock [Domain]
Interest Expense
Interest Expense [Member]
Net Carrying Amount
Intangible Assets, Net (Excluding Goodwill)
Increase (decrease) in accrued capital improvements, leasing and other investing activity costs
Increase (Decrease) in Accrued Capital Improvements Leasing and Other Investing Activity Costs
The net change during the reporting period in future cash outflow to pay for purchases of fixed assets, construction in progress expenditures, deferred leasing costs and other investing activity costs that have occurred.
Product and Service [Domain]
Product and Service [Domain]
Notes Receivable from the City of Huntsville
Notes receivable from the City of Huntsville
Notes Receivable from the City of Huntsville
Notes Receivable from City of Huntsville [Member]
Represents notes receivable from City of Huntsville.
5300 Redstone Gateway
5300 Redstone Gateway [Member]
5300 Redstone Gateway
Concentration risk
Customer Concentration Risk [Member]
Reconciliation of UJV NOI allocable to COPT Defense to Equity Income in Unconsolidated entities [Abstract]
Reconciliation of Operating Income from Unconsolidated Joint Ventures to Equity Method Investments [Abstract]
Reconciliation of Operating Income from Unconsolidated Joint Ventures to Equity Method Investments [Abstract]
Interest expense at stated interest rate
Interest Expense, Debt, Excluding Amortization
2027
Sales-Type and Direct Financing Leases, Payment to be Received, Year Two
Net income (loss)
Net income (loss)
Net income (loss)
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest
2028
Lessor, Operating Lease, Payment to be Received, Year Three
Restatement does not require Recovery
Restatement Does Not Require Recovery [Text Block]
Construction commencement threshold (in sqft)
Construction Commencement Threshold
Represents a defined threshold for square footage of construction commencement for Company to be able to acquire partner's interest after five years.
Notional Amount
Derivative, Notional Amount
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization, Consolidation and Presentation of Financial Statements [Abstract]
4400 River Road
4400 River Road [Member]
4400 River Road
Cash paid for amounts included in the measurement of lease liabilities
Cash Flow, Operating Activities, Lessee [Abstract]
Total contractual payments
Sales-Type and Direct Financing Leases, Payment to be Received
City Area Code
City Area Code
Award Timing, How MNPI Considered
Award Timing, How MNPI Considered [Text Block]
Capitalized interest costs
Interest Costs Capitalized
7063 Columbia Gateway Drive
7063 Columbia Gateway Drive [Member]
Represents the information pertaining to 7063 Columbia Gateway Drive, an office property owned by the entity.
Operating properties, net
Operating properties, net
Rental Properties
2691 Technology Drive
2691 Technology Drive [Member]
Represents the information pertaining to 2691 Technology Drive, an office property owned by the entity.
Revolving Credit Facility
Proceeds from Long-Term Lines of Credit
Schedule of Accounts Receivable, Contract Assets and Contract Liabilities
Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block]
1200 Redstone Gateway
1200 Redstone Gateway [Member]
Number 1200 Redstone Gateway [Member]
Cash flows from investing activities
Cash Provided by (Used in) Investing Activity, Including Discontinued Operation [Abstract]
312 Sentinel Way
312 Sentinel Way [Member]
Represents the information pertaining to 312 Sentinel Drive, an office property owned by the entity.
Pay vs Performance Disclosure
Pay vs Performance Disclosure [Table]
Oak Grove A
Oak Grove A [Member]
Oak Grove A [Member]
Disposed of by sale
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member]
Preferred return on capital contributions used to fund infrastructure costs
Joint Venture, Preferred Return On Infrastructure Capital Contributions
Joint Venture, Preferred Return On Infrastructure Capital Contributions
Extension fee percentage
Debt Instrument, Extension Fee Percentage
Debt Instrument, Extension Fee Percentage
Lease costs
Lease, Cost
Other liabilities
Other Liabilities
Estimate of possible loss (up to)
Loss Contingency, Estimate of Possible Loss
Schedule of Property Lease Cost and Effect of Property Lease Payments on Consolidated Statements of Cash Flows
Lease, Cost [Table Text Block]
Notes receivable, fair value disclosure
Notes Receivable, Fair Value Disclosure
Estimated pre-vesting forfeitures
Share-based Compensation Arrangement by Share-based Payment Award, Estimated Percentage of Forfeitures
Represents the estimated pre-vesting percentage of forfeitures considered for reduction in stock compensation expense recognized during the period.
16539 Commerce Drive
16539 Commerce Drive [Member]
Represents the information pertaining to 16539 Commerce Drive, an office property owned by the entity.
Auditor Name
Auditor Name
Organization
Nature of Operations [Text Block]
Concentration Risk [Table]
Concentration Risk [Table]
Maximum environmental indemnification to the tenant against consequential damages after acquisition of property
Maximum Additional Costs Agreed To Be Paid By The Entity Under Environmental Indemnification Agreement
Maximum additional costs agreed to be paid by the entity under environmental indemnification agreement
PB PIU Grants 2021
PB PIU Grants 2021 [Member]
PB PIU Grants 2021
Assumptions used to value stock awards
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Land Leases
Land Leases [Member]
Land Leases
Write-offs
Credit Losses, Financial Assets And Other Instruments, Write offs
Credit Losses, Financial Assets And Other Instruments, Write offs
Other Performance Measure, Amount
Other Performance Measure, Amount
Aggregate cost of assets for federal income tax purposes
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Federal Income Tax Basis
Asset acquisition, percentage leased
Asset Acquisition, Percentage Leased
Asset Acquisition, Percentage Leased
Investments in Marketable Securities
Marketable Securities, Policy [Policy Text Block]
Fair Value Measurements
Fair Value Measurement, Policy [Policy Text Block]
2026
Lessor, Operating Lease, Payment to be Received, Year One
Dividends
Dividends
1201 Winterson Road
1201 Winterson Road [Member]
Represents the information pertaining to 1201 Winterson Road, an office property owned by the entity.
15059 Conference Center Drive
15059 Conference Center Drive [Member]
Represents the information pertaining to 15059 Conference Center Drive, an office property owned by the entity.
Derivative Instrument Risk [Axis]
Derivative Instrument [Axis]
Restricted cash at beginning of year
Restricted cash at end of year
Restricted Cash
Leases
Lessee, Finance Leases [Text Block]
Entity [Domain]
Entity [Domain]
Net cash used in investing activities
Cash Provided by (Used in) Investing Activity, Including Discontinued Operation
Investment in unconsolidated real estate joint ventures
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures
Revenue, allocated to remaining performance obligations, expected timing of satisfaction, period
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period
Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table
Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table [Member]
Interest expense paid
Interest Paid, Excluding Capitalized Interest, Operating Activity
Finance right-of-use asset contributed by noncontrolling interest in joint venture
Right-of-Use Asset Contributed By Noncontrolling Interest
Right-of-Use Asset Contributed By Noncontrolling Interest
Document Fiscal Year Focus
Document Fiscal Year Focus
Basis of Presentation
Basis of Accounting, Policy [Policy Text Block]
Property - operating lease right-of-use assets
Operating leases - Property
Operating Lease, Right-of-Use Asset
Operating Properties, Net
Operating Properties [Member]
Represents information pertaining to operating properties of the entity.
Other
Other
Other Operating Segment [Member]
Property leases - fixed
Operating Lease, Cost
Plan Name [Domain]
Plan Name [Domain]
Carrying Amount
Reported Value Measurement [Member]
Expected weighted average period during which unrecognized compensation cost will be recognized
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition
Real Estate [Abstract]
Real Estate [Abstract]
Percentage of residual distributable cash flows in excess of unpaid cumulative preferred returns and return of invested capital entitled to the company
Percentage of Residual Distributable Cash Flows Entitled in Excess of Unpaid Cumulative Preferred Returns and Return of Invested Capital
Represents the percentage of residual distributable cash flows in excess of unpaid cumulative preferred returns and return of invested capital in the joint venture to which the entity will be entitled.
Equity [Abstract]
Interest Rate Derivatives
Derivatives, Policy [Policy Text Block]
Information by Business Segment
Segment Reporting Disclosure [Text Block]
Assets and liabilities measured at fair value on a recurring basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Increase (Decrease) in Shareholders' Equity
Increase (Decrease) in Stockholders' Equity [Roll Forward]
7200 Riverwood Drive
7200 Riverwood Drive [Member]
Represents the information pertaining to 7200 Riverwood Drive, an office property owned by the entity.
Intangible assets on real estate acquisitions
Intangible assets on real estate acquisitions
Finite-Lived Intangible Assets [Line Items]
Other consolidated entities
Minority Interest in Net Income (Loss) Other Including Joint Ventures Minority Interests
Amount of net income (loss) for the period allocated to noncontrolling shareholders, partners, or other equity holders in one or more of the entities consolidated into the reporting entity's financial statements other than operating partnerships or interests held by preferred unit holders.
Compensation Actually Paid vs. Total Shareholder Return
Compensation Actually Paid vs. Total Shareholder Return [Text Block]
Payout percentage reduction when TSR percentile rank exceeds target and TSR is negative
Share-Based Compensation Arrangement by Share-Based Payment Award, Payout Percentage Reduction When Total Shareholders Return (TSR) Percentile Rank Exceeds Target and TSR Is Negative
Share-Based Compensation Arrangement by Share-Based Payment Award, Payout Percentage Reduction When Total Shareholders Return (TSR) Percentile Rank Exceeds Target and TSR Is Negative
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Table]
Fair Value, Recurring and Nonrecurring [Table]
Leased Assets, as a Lessee
Lessee, Leases [Policy Text Block]
Sentry Gateway - W
Sentry Gateway - W [Member]
Represents the information pertaining to Sentry Gateway - W, an office property owned by the entity.
General, administrative, leasing and other expenses
General, administrative, leasing and other expenses
Selling, General and Administrative Expense
Other fixed-rate debt
Other Fixed Rate Debt [Member]
Fixed-rate debt excluding other fixed rate debt not separately disclosed.
Redemption of vested equity awards
Stock Repurchased During Period, Value
Depreciation and other amortization
Depreciation, Depletion and Amortization
Other capital improvements on operating properties
Payments for Capital Improvements
Exchange rate
Debt Instrument, Convertible, Conversion Ratio
7005 Columbia Gateway Drive
7005 Columbia Gateway Drive [Member]
Number 7005 Columbia Gateway Drive [Member]
6721 Columbia Gateway Drive
6721 Columbia Gateway Drive [Member]
Represents the information pertaining to 6721 Columbia Gateway Drive, an office property owned by the entity.
FFP
Fixed-Price Contract [Member]
Revolving Credit Facility
Revolving Credit Facility [Member]
30 Light Street
30 Light Street [Member]
Number 30 Light Street [Member]
Finance leases - Property
Lease liability
Finance Lease, Liability
Arrangement Duration
Trading Arrangement Duration
Ordinary income
Dividends Declared, Ordinary Income Percentage
Represents the percentage of aggregate dividends declared during the period treated as ordinary income for federal tax purposes.
7318 Parkway Drive
7318 Parkway Drive [Member]
Represents the information pertaining to 7318 Parkway Drive, an office property owned by the entity.
310 The Bridge Street
310 the Bridge Street [Member]
Represents the information pertaining to 310 The Bridge Street, an office property owned by the entity.
Expedition VII
Expedition VII [Member]
Represents the information pertaining to Expedition VII, an office property owned by the entity.
7130 Columbia Gateway Drive
7130 Columbia Gateway Drive [Member]
Represents the information pertaining to 7130 Columbia Gateway Drive, an office property owned by the entity.
Segments [Axis]
Segments [Axis]
Real Estate Properties Status [Axis]
Real Estate Properties Status [Axis]
Information by status of the property.
Initial offering price
Debt Instrument, Issuance Price, Percentage
Debt Instrument, Issuance Price, Percentage
Award Level [Axis]
Award Level [Axis]
Award Level
Noncontrolling interests in subsidiaries
Equity, Attributable to Noncontrolling Interest [Abstract]
Local Phone Number
Local Phone Number
Additional 402(v) Disclosure
Additional 402(v) Disclosure [Text Block]
Real Estate, Joint Ventures [Table]
Real Estate, Joint Ventures [Table]
Tabular disclosure of information related to unconsolidated and consolidated real estate joint ventures.
Other
Payment for (Proceeds from) Other Investing Activity
Other
Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity, Other Item
Thereafter
Long-Term Debt, Maturity, after Year Five
Share-Based Compensation and Other Compensation Matters
Share-Based Payment Arrangement [Text Block]
Beginning balance
Ending balance
Credit Losses, Financial Assets and Other Instruments, Allowance for Credit Loss
Credit Losses, Financial Assets and Other Instruments, Allowance for Credit Loss
7740 Milestone Parkway
7740 Milestone Parkway [Member]
Represents the information pertaining to7740 Milestone Parkway, an office property owned by the entity.
Target Level
Target Level [Member]
Target Level
Assets
Assets [Abstract]
Credit Facility [Axis]
Credit Facility [Axis]
Underlying Security Market Price Change
Underlying Security Market Price Change, Percent
Schedule of Computation of NOI from Service Operations
Schedule of Net Operating Income from Segments from Service Operations [Table Text Block]
Tabular disclosure of the computation of net operating income from service operations.
901 Elkridge Landing Road
901 Elkridge Landing Road [Member]
Represents the information pertaining to 901 Elkridge Landing Road, an office property owned by the entity.
Other Commitments [Axis]
Other Commitments [Axis]
Unsecured note payable
Unsecured Note Payable Due May 2026 [Member]
Unsecured Note Payable Due May 2026
Debt Instrument [Axis]
Debt Instrument [Axis]
Forfeited (in dollars per share or unit)
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value
Fair Value Measurements
Fair Value Disclosures [Text Block]
306 Sentinel Drive
306 Sentinel Drive [Member]
Represents the information pertaining to 306 Sentinel Drive, an office property owned by the entity.
Unvested shares that are expected to vest (in shares or units)
Share-based Compensation Arrangement by Share-based Payment Award Equity Instruments Other than Options Expected to Vest Outstanding Number
Represents the number of expected to vest equity-based payment instruments, excluding stock (or unit) options, as of the balance sheet date.
Loss on early extinguishment of debt
Loss on early extinguishment of debt
Gain (Loss) on Extinguishment of Debt
Credit Facility [Domain]
Credit Facility [Domain]
Shareholders’ equity
Equity, Attributable to Parent [Abstract]
304 Sentinel Drive
304 Sentinel Drive [Member]
Represents the information pertaining to 304 Sentinel Drive, an office property owned by the entity.
Approximate amount to be reclassified from AOCL to interest expense over the next 12 months
Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net
Deferred revenue associated with operating leases
Deferred Revenue
Interest rate
Debt Instrument, Interest Rate, Stated Percentage
Investment, Name [Axis]
Investment, Name [Axis]
300 Sentinel Drive
300 Sentinel Drive [Member]
Represents the information pertaining to 300 Sentinel Drive, an office property owned by the entity.
Entity Voluntary Filers
Entity Voluntary Filers
7134 Columbia Gateway Drive
7134 Columbia Gateway Drive [Member]
Represents the information pertaining to 7134 Columbia Gateway Drive, an office property owned by the entity.
Beginning balance
Ending balance
Contract with Customer, Receivable, after Allowance for Credit Loss
Westfields - Park Center
Westfields Park Center [Member]
Represents the information pertaining to Westfields - Park Center, an office property owned by the entity.
540 National Business Parkway
540 National Business Parkway [Member]
Number 540 National Business Parkway [Member]
Properties
Property, Plant and Equipment [Abstract]
Accounts receivable, net
Accounts Receivable, after Allowance for Credit Loss
Entity Registrant Name
Entity Registrant Name
Dahlgren Technology Center
Dahlgren Technology Center [Member]
Represents the information pertaining to Dahlgren Technology Center, an office property owned by the entity.
Stock Price or TSR Estimation Method
Stock Price or TSR Estimation Method [Text Block]
Tenant improvements on operating properties
Payments for Tenant Improvements
Common units in CDPLP
Noncontrolling Interest in Net Income (Loss) Operating Partnerships, Nonredeemable
Other dispositions
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation, Other Deduction
Schedule of Assumptions Used in Monte Carlo Models for PB-PIUs
Schedule of Share-based Payment Award Performance Share Units Valuation Assumptions [Table Text Block]
Tabular disclosure of the significant assumptions used during the year to estimate the fair value of performance share units, including, but not limited to: (a) Grant date fair value (b) baseline common share value (c) expected volatility of the entity's shares, and (d) risk-free rate(s).
PSU Grants 2022
PSU Grants 2022 [Member]
PSU Grants 2022
COPT Defense Properties, L.P.
COPT Defense Properties, LP [Member]
COPT Defense Properties, LP
Lessee, right-of-use asset
Total right-of-use assets
Lease, Right-of-Use Assets
Lease, Right-of-Use Assets
1243 Winterson Road
1243 Winterson Road [Member]
Represents the information pertaining to 1243 Winterson Road, an office property owned by the entity.
Schedule of Debt
Schedule of Debt [Table Text Block]
Non-operating property assets
Segment Reporting, Reconciling Item, Excluding Corporate Nonsegment [Member]
Granted (in dollars per share or unit)
Grant date fair value (in dollars per share or unit)
Grant Date Fair Value Per Award (in dollars per share or unit)
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value
Credit Losses, Financial Assets and Other Instruments [Roll Forward]
Credit Losses, Financial Assets and Other Instruments [Roll Forward]
Credit Losses, Financial Assets and Other Instruments
Schedule of Intangible Assets
Schedule of Finite-Lived Intangible Assets [Table Text Block]
Revolving Credit Facility
Repayments of Long-Term Lines of Credit
Restatement Determination Date:
Restatement Determination Date [Axis]
NoVA Office B
NOVA Office B [Member]
NOVA Office B [Member]
135 National Business Parkway
135 National Business Parkway [Member]
Represents the information pertaining to 135 National Business Parkway, an office property owned by the entity.
Old Annapolis Road
Old Annapolis Road [Member]
Represents the information pertaining to Old Annapolis Road, an office property owned by the entity.
National Business Park North
National Business Park North [Member]
Represents the information pertaining to National Business Park North, an office property owned by the entity.
Other
Proceeds from (Payment for) Other Financing Activity
Total
Interest Expense, Debt
320 Sentinel Way
320 Sentinel Way [Member]
Represents the information pertaining to 320 Sentinel Drive, an office property owned by the entity.
Name
Trading Arrangement, Individual Name
Number of properties reclassified between segments
Number Of Properties Intersegment Reclassification
Number Of Properties Intersegment Reclassification
Conversion of common units to common shares
Stock Issued During Period, Value, Conversion of Units
Contract with Customer, Basis of Pricing [Domain]
Contract with Customer, Basis of Pricing [Domain]
Real estate
Other Real Estate, Additions
Debt instrument, face amount
Loan amount
Debt Instrument, Face Amount
Statement of Comprehensive Income [Abstract]
Statement of Comprehensive Income [Abstract]
209 Research Boulevard
209 Research Boulevard [Member]
Represents the information pertaining to 209 Research Boulevard, an office property owned by the entity.
Minimum payout percentage if TSR is at least 10%
Share-Based Compensation Arrangement by Share-Based Payment Award, Minimum Payout Percentage If Total Shareholder Return Is At Least Ten Percent
Share-Based Compensation Arrangement by Share-Based Payment Award, Minimum Payout Percentage If Total Shareholder Return Is At Least Ten Percent
15049 Conference Center Drive
15049 Conference Center Drive [Member]
Represents the information pertaining to 15049 Conference Center Drive, an office property owned by the entity.
Preferred Units
Preferred Stock [Member]
Name
Awards Close in Time to MNPI Disclosures, Individual Name
Unvested at the beginning of the period (in dollars per share or unit)
Unvested at the end of the period (in dollars per share or unit)
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value
9700 Advanced Gateway
9700 Advanced Gateway [Member]
9700 Advanced Gateway
Aggregate Erroneous Compensation Not Yet Determined
Aggregate Erroneous Compensation Not Yet Determined [Text Block]
ICFR Auditor Attestation Flag
ICFR Auditor Attestation Flag
Asset Acquisition [Line Items]
Asset Acquisition [Line Items]
310 Sentinel Way
310 Sentinel Way [Member]
Number 310 Sentinel Way [Member]
Credit Loss [Abstract]
Schedule of Property Finance Lease, Liability, Maturity
Finance Lease, Liability, to be Paid, Maturity [Table Text Block]
M Square Research Park
M Square Research Park [Member]
Represents the information pertaining to M Square Research Park, an office property owned by the entity.
Redshift JV LLC
Redshift
Redshift JV LLC [Member]
Redshift JV LLC
Lessor, Lease, Description [Table]
Lessor, Lease, Description [Table]
Auditor Firm ID
Auditor Firm ID
Segments [Domain]
Segments [Domain]
1201 M Street SE
1201 M Street SE [Member]
Represents the information pertaining to 1201 M Street SE, an office property owned by the entity.
Statement of Income Location, Balance [Axis]
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs, by Report Line [Axis]
Statement of Income Location, Balance [Axis]
Investment in unconsolidated real estate joint ventures retained in property disposition
Increase in Investment in Unconsolidated Real Estate Joint Venture in Connection With Partial Sale of Properties
Increase in Investment in Unconsolidated Real Estate Joint Venture in Connection With Partial Sale of Properties
22289 Exploration Drive
22289 Exploration Drive [Member]
Represents the information pertaining to 22289 Exploration Drive, an office property owned by the entity.
Remaining borrowing capacity
Line of Credit Facility, Remaining Borrowing Capacity
Right-of-use assets
Lease Right of Use Assets [Abstract]
Lease Right of Use Assets
Schedule of Real Estate [Table]
Schedule of Real Estate [Table]
Schedule that includes carrying amount of properties, accumulated depreciation and other information for real estate properties, by status.
Fair Value, Measurements, Fair Value Hierarchy [Domain]
Fair Value Hierarchy and NAV [Domain]
Statement of Financial Position Location, Balance [Domain]
Statement of Financial Position Location, Balance [Domain]
Amortization of deferred financing costs and net debt discounts
Amortization of Debt Issuance Costs and Discounts
2701 Technology Drive
2701 Technology Drive [Member]
Represents the information pertaining to 2701 Technology Drive, an office property owned by the entity.
Performance Based Awards
Performance Based Awards [Member]
Performance Based Awards
Revenue Recognition
Revenue [Policy Text Block]
Unsecured Senior Notes
Unsecured Senior Notes
Senior Notes [Member]
Income Tax Disclosure [Table]
Income Tax Disclosure [Table]
Income Tax Disclosure [Table]
Computation of net operating income from service operations
Operating Income (Loss) [Abstract]
Construction contract and other service revenues received
Construction Contract and Other Service Revenues Received
Cash received for building and real estate development, which may include improvements (such as drainage, utilities, grading and subdividing) to a parcel of land, and general contracting services and from the sale of other goods or rendering of other services.
Total lease liabilities
Operating properties lease liabilities included in segment assets
Lease, Liability
Lease, Liability
All Executive Categories
All Executive Categories [Member]
6724 Alexander Bell Drive
6724 Alexander Bell Drive [Member]
Represents the information pertaining to 6724 Alexander Bell Drive, an office property owned by the entity.
7000 Columbia Gateway Drive
7000 Columbia Gateway Drive [Member]
Represents the information pertaining to 7000 Columbia Gateway Drive, an office property owned by the entity.
Expense Classification
Expense Classification [Policy Text Block]
Disclosure of accounting policy for classification of costs of property operating expenses and general, administrative and leasing expense.
Common Shares of beneficial interest ($0.01 par value; 150,000,000 shares authorized; shares issued and outstanding of 113,210,642 at December 31, 2025 and 112,703,460 at December 31, 2024)
Common Stock, Value, Issued
Percentage of residual amounts distributed to each member
Joint Venture, Percentage of Residual Net Cash Flow Distributed to Each Member, Percentage
Represents the percentage in which the residual net cash flows will be distributed to each partner.
Finance leases - Property
Finance Lease, Right-of-Use Asset, after Accumulated Amortization
Interest and other income received
Interest and Other Income Received
Interest and Other Income Received
Proceeds from collection of investing receivables, principal and interest
Proceeds From Collection Of Notes Receivable, Principal And Interest
Proceeds From Collection Of Notes Receivable, Principal And Interest
Operating Activities [Domain]
Operating Activities [Domain]
Title and Position [Axis]
Title and Position [Axis]
13857 McLearen Road
13857 McLearen Road [Member]
Number 13857 McLearen Road [Member]
Commitments and contingencies (Note 17)
Commitments and Contingencies
Purchase price credit
Asset Acquisition, Purchase Price Credit
Asset Acquisition, Purchase Price Credit
Comprehensive income (loss)
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest
6741 Columbia Gateway Drive
6741 Columbia Gateway Drive [Member]
Represents the information pertaining to 6741 Columbia Gateway Drive, an office property owned by the entity.
Term Loan Facility
Loans Payable [Member]
B RE COPT DC JV III LLC
B RE COPT DC JV III LLC [Member]
B RE COPT DC JV III LLC
Schedule of Restricted Share and TB-PIU Activity
Schedule of Nonvested Share Activity [Table Text Block]
Noncontrolling Interests
Noncontrolling Interest [Member]
14850 Conference Center Drive
14850 Conference Center Drive [Member]
Represents the information pertaining to 14850 Conference Center Drive, an office property owned by the entity.
Interest rate derivatives
Interest Rate Derivative Liabilities, at Fair Value
6750 Alexander Bell Drive
6750 Alexander Bell Drive [Member]
Represents the information pertaining to 6750 Alexander Bell Drive, an office property owned by the entity.
Washington DC
DISTRICT OF COLUMBIA
Ownership interest
Nominal Ownership %
Equity Method Investment, Ownership Percentage
Thereafter
Lessor, Operating Lease, Payment to be Received, after Year Five
Net income (loss) attributable to common shareholders
Net income (loss) attributable to common shareholders
Net Income Loss Available To Common Stockholders, Including Participating Securities
Amount, after deduction of tax, noncontrolling interests, dividends on preferred stock; of income (loss) available to common shareholders, including participating securities.
Concentration Risk [Line Items]
Concentration Risk [Line Items]
Distributions to owners of common units in CDPLP
Minority Interest (Decrease) from Distributions to Operating Partnership Noncontrolling Interest Holders
Decrease in noncontrolling interest balance from payment of distributions to noncontrolling interest holders in the Operating Partnership.
6708 Alexander Bell Drive
6708 Alexander Bell Drive [Member]
Represents the information pertaining to 6708 Alexander Bell Drive, an office property owned by the entity.
7770 Backlick Road
7770 Backlick Road [Member]
Represents the information pertaining to 7770 Backlick Road, an office property owned by the entity.
The number of percentile ranks to fall between to earn interpolated PB-PIUs between such percentile ranks, conditioned on the percentile rank exceeding 25%
Number Of Percentile Ranks To Fall Between To Earn Interpolated PIU
The number of percentile ranks to fall between to earn interpolated PIUs between such percentile ranks, conditioned on the percentile rank exceeding 25%.
PEO Actually Paid Compensation Amount
PEO Actually Paid Compensation Amount
Net credit loss expense (recoveries)
Credit Losses, Financial Assets and Other Instruments, Allowance for Credit Loss, Expense (Reversal)
Credit Losses, Financial Assets and Other Instruments, Allowance for Credit Loss, Expense (Reversal)
Capitalized to development activities
Capitalized to Development Activities [Member]
Represents the allocation (or location) of expenses capitalized to development activities.
Award Level [Domain]
Award Level [Domain]
Award Level [Domain]
Revenue from Contract with Customer [Abstract]
Revenue from Contract with Customer [Abstract]
Hedging Designation [Axis]
Hedging Designation [Axis]
PSU Grants 2024
PSU Grants 2024 [Member]
PSU Grants 2024
Change in Contract with Customer, Asset
Change in Contract with Customer, Asset [Abstract]
Number of impaired parcels of land
Number Of Impaired Parcels Of Land
Number Of Impaired Parcels Of Land
Schedule of Allocation of Acquisition Costs
Asset Acquisition [Table Text Block]
Cash and cash equivalents and restricted cash
Cash and Cash Equivalent [Abstract]
Grant Date Fair Value
Aggregate Grant Date Fair Value
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Aggregate Fair Value
The aggregate fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).
Derivative Contract Type [Domain]
Derivative Contract [Domain]
Distributions paid to redeemable noncontrolling interests
Payments of Distributions, Redeemable Noncontrolling Interest
Payments of Distributions, Redeemable Noncontrolling Interest
Performance period of the award
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Requisite Service Period
All Individuals
All Individuals [Member]
Long-term Debt, Type [Domain]
Long-Term Debt, Type [Domain]
Decrease in noncontrolling interests and increase in shareholders’ equity in connection with the conversion of common units into common shares
Equity Change Stock Issued During Period Value Conversion of Units
Change in equity from stock issued during the period upon the conversion of units. An example of a convertible unit is an umbrella partnership real investment trust unit (UPREIT unit).
Fair Value Disclosures [Abstract]
Fair Value Disclosures [Abstract]
MP 3
MP 3 [Member]
MP 3
Name
Forgone Recovery, Individual Name
100 Light Street
100 Light Street [Member]
Number 100 Light Street [Member]
Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested
Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested [Member]
206 Research Boulevard
206 Research Boulevard [Member]
Represents the information pertaining to 206 Research Boulevard, an office property owned by the entity.
Disposal Group Classification [Axis]
Disposal Group Classification [Axis]
430 National Business Parkway
430 National Business Parkway [Member]
Represents the information pertaining to 430 National Business Parkway, an office property owned by the entity.
Weighted average interest rate
Debt, Weighted Average Interest Rate
Stock issued for settlement of vested awards, aggregate intrinsic value
Share-Based Compensation Arrangement by Share-Based Payment Award, Shares Issued in Period, Aggregate Intrinsic Value
Share-Based Compensation Arrangement by Share-Based Payment Award, Shares Issued in Period, Aggregate Intrinsic Value
Add: Equity in income (loss) of unconsolidated non-real estate entities
Income (Loss) in Non-Real Estate Equity Method Investments
Income (Loss) in Non-Real Estate Equity Method Investments
250 W Pratt St
250 W Pratt St [Member]
Number 250 W Pratt St [Member]
PB-PIUs
Performance-based PIUs [Member]
Performance-based PIUs [Member]
Floating Rate Index, over SOFR
Derivative, Basis Spread on Variable Rate
2020 and Earlier
Financing Receivable, Originated, More than Five Years before Current Fiscal Year
Schedule of Key Terms and Fair Values of Interest Rate Swap Derivatives
Schedule of Derivative Instruments [Table Text Block]
Real Estate Property Classification [Axis]
Real Estate Property Classification [Axis]
Represents information regarding classification of real estate properties.
Gain on sales of real estate
Gain (Loss) on Sale of Properties
Erroneous Compensation Analysis
Erroneous Compensation Analysis [Text Block]
Intangible Asset, Finite-Lived [Table]
Intangible Asset, Finite-Lived [Table]
Interest rate swap, effective February 1, 2023
Interest Rate Swap, Effective February 2023 3.747% [Member]
Interest Rate Swap, Effective February 2023 3.747%
Geographical [Axis]
Geographical [Axis]
Lessee, Lease, Description [Line Items]
Lessee, Lease, Description [Line Items]
Rule 10b5-1 Arrangement Terminated
Rule 10b5-1 Arrangement Terminated [Flag]
Leases
Lessor, Operating Leases [Text Block]
8000 Rideout Road
8000 Rideout Road [Member]
8000 Rideout Road [Member]
Income attributable to share-based compensation awards for basic EPS
Participating Securities, Distributed and Undistributed Earnings (Loss), Basic
2.75%, $600,000 aggregate principal
Unsecured Senior Notes Due April 2031 [Member]
Unsecured Senior Notes Due April 2031
Erroneously Awarded Compensation Recovery
Erroneously Awarded Compensation Recovery [Table]
Concentration Risk Benchmark [Domain]
Concentration Risk Benchmark [Domain]
Title of 12(b) Security
Title of 12(b) Security
Lessee, Lease, Description [Table]
Lessee, Lease, Description [Table]
8300 Rideout Road
8300 Rideout Road [Member]
8300 Rideout Road
Non-investment grade
Internal Noninvestment Grade [Member]
7125 Columbia Gateway Drive
7125 Columbia Gateway Drive [Member]
Represents the information pertaining to 7125 Columbia Gateway Drive, an office property owned by the entity.
Schedule on basis of which debt matures
Long-Term Debt, Fiscal Year Maturity [Abstract]
Earnings per common share
Earnings per common share:
Earnings Per Share [Abstract]
2030
Lessee, Operating Lease, Liability, to be Paid, Year Five
Non-operating distributions from unconsolidated real estate joint venture
Proceeds from Equity Method Investment, Distribution, Return of Capital
16480 Commerce Drive
16480 Commerce Drive [Member]
Represents the information pertaining to 16480 Commerce Drive, an office property owned by the entity.
PSU Grants 2025
PSU Grants 2025 [Member]
PSU Grants 2025
Schedule of Securities Excluded from Computation of Diluted Earnings Per Share
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]
Schedule of Interest Expense
Interest Income and Interest Expense Disclosure [Table Text Block]
Redstone Arsenal
Redstone Arsenal [Member]
Redstone Arsenal [Member]
BREIT COPT DC JV LLC
BREIT COPT DC JV LLC [Member]
BREIT COPT DC JV LLC [Member]
Aggregate cost of assets for federal income tax purposes, net of accumulated depreciation
SEC Schedule, 12-28 Real Estate Companies, Investment In Real Estate, Federal Income Tax Basis, Net Of Accumulated Depreciation
SEC Schedule, 12-28 Real Estate Companies, Investment In Real Estate, Federal Income Tax Basis, Net Of Accumulated Depreciation
7500 Advanced Gateway
7500 Advanced Gateway [Member]
7500 Advanced Gateway [Member]
Weighted average TB-PIUs
Unvested TB-PIUs [Member]
Unvested TB-PIUs [Member]
Thereafter
Finance Lease, Liability, to be Paid, after Year Five
Award Timing Disclosures [Line Items]
COPT Defense Properties
COPT Defense Properties [Member]
COPT Defense Properties
2.25%, 2.75%, 2.00%, 2.90% and 4.50% Unsecured Senior Notes
Unsecured Senior Notes 2.25%, 2.75%, 2.00%, 2.90% And 4.50% [Member]
Unsecured Senior Notes 2.25%, 2.75%, 2.00%, 2.90% And 4.50%
Southpoint Phase 2 Bldg A
Southpoint Phase 2 Bldg A [Member]
Southpoint Phase 2 Bldg A
Equity
Equity [Text Block]
2023
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year
Adjustments for changes in fair value of redeemable noncontrolling interests
Adjustment for Changes in Fair Value of Redeemable Noncontrolling Interests
Adjustment for Changes in Fair Value of Redeemable Noncontrolling Interests
Schedule of Payouts for Defined Performance Under PB-PIU
Schedule of Share-based Compensation Arrangement by Share-based Payment Award for Defined Performance [Table Text Block]
Schedule of payouts for defined performance under performance-based awards of share-based compensation
Interest rate swaps designated as cash flow hedges
Interest Rate Cash Flow Hedge Liability at Fair Value
Total properties, net
Real Estate Investment Property, Net
Fixed
Operating Lease, Lease Income, Lease Payments
Gross
Total
Beginning balance
Ending balance
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross
Cost-plus fee
Cost-plus Fee Contract [Member]
Cost-plus Fee Contract [Member]
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Segment financial information for real estate operations
Segment Reporting Information [Line Items]
Number of preferred shares authorized (in shares)
Preferred Stock, Shares Authorized
Adoption Date
Trading Arrangement Adoption Date
Reclassifications
Reclassification, Comparability Adjustment [Policy Text Block]
Beginning balance
Ending balance
Contract with Customer, Asset, after Allowance for Credit Loss
Properties Under Development
Properties Under Development [Member]
Properties Under Development
Improvements and other additions
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Improvements
Customer [Axis]
Customer [Axis]
NOI
NOI
Operating Income (Loss)
Tenant relationship value
Tenant relationship value
Customer Relationships [Member]
Line of Credit
Line of Credit [Member]
Real Estate and Accumulated Depreciation, Description of Property [Axis]
Name of Property [Axis]
2100 Rideout Road
2100 Rideout Road [Member]
Number 2100 Rideout Road [Member]
Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested
Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested [Member]
Project EX
Project EX [Member]
Project EX [Member]
5520 Research Park Drive
5520 Research Park Drive [Member]
Represents the information pertaining to 5520 Research Park Drive, an office property owned by the entity.
Approximate amount by which basis of assets and liabilities for tax reporting purposes is higher (lower) than amount reported on consolidated balance sheet
Approximate Amount by which Net Basis of Assets and Liabilities for Tax Reporting Purposes is Higher (Lower) than Amount Reported on Consolidated Balance Sheet
Represents the approximate amount by which basis of assets and liabilities for tax reporting purposes are higher (lower) than the amount reported on consolidated balance sheet.
Stock issued for settlement of vested awards, weighted average grant date fair value (in dollars per share)
Share-Based Compensation Arrangement by Share-Based Payment Award, Shares Issued in Period, Weighted Average Grant Date Fair Value
Share-Based Compensation Arrangement by Share-Based Payment Award, Shares Issued in Period, Weighted Average Grant Date Fair Value
Southpoint Phase 2 Bldg B
Southpoint Phase 2 Bldg B [Member]
Southpoint Phase 2 Bldg B
NoVA Office D
NOVA Office D [Member]
NOVA Office D [Member]
Class of Stock [Axis]
Class of Stock [Axis]
Subsequent Event Type [Domain]
Subsequent Event Type [Domain]
Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table
Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table [Member]
316 Sentinel Way
316 Sentinel Way [Member]
Represents the information pertaining to 316 Sentinel Drive, an office property owned by the entity.
Interest and other income, net
Interest and other income, net
Other Nonoperating Income (Expense)
Statement [Table]
Statement [Table]
NoVA Office C
Nova Office C [Member]
Nova Office C [Member]
Reconciliation of net income (loss) to net cash provided by operating activities
Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity [Abstract]
Cash flows from financing activities
Cash Provided by (Used in) Financing Activity, Including Discontinued Operation [Abstract]
Unconsolidated Joint Ventures With Deficit Balances
Unconsolidated Joint Ventures With Deficit Balances [Member]
Unconsolidated Joint Ventures With Deficit Balances
Property operating expenses paid
Property Operating Expenses Paid
This element represents the amount of cash paid during the current period for costs that are directly related to generation of revenues from leased and rented properties or equipment.
6940 Columbia Gateway Drive
6940 Columbia Gateway Drive [Member]
Represents the information pertaining to 6940 Columbia Gateway Drive, an office property owned by the entity.
Beginning balance
Ending balance
Contract with Customer, Liability
Term loan facility
Repayments of Unsecured Debt
Schedule of Credit Losses, Financial Assets and Other Instruments, Allowance for Credit Loss
Schedule of Credit Losses, Financial Assets and Other Instruments, Allowance for Credit Loss [Table Text Block]
Schedule of Credit Losses, Financial Assets and Other Instruments, Allowance for Credit Loss [Table Text Block]
All Adjustments to Compensation
All Adjustments to Compensation [Member]
2721 Technology Drive
2721 Technology Drive [Member]
Represents the information pertaining to 2721 Technology Drive, an office property owned by the entity.
Amendment Flag
Amendment Flag
Number of common shares of beneficial interest authorized to be issued
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized
Schedule of Intangible Assets Acquired
Schedule of Acquired Finite-Lived Intangible Assets by Major Class [Table Text Block]
2600 Park Tower Drive
2600 Park Tower Drive [Member]
Number 2600 Park Tower Drive [Member]
Variable-rate secured debt
Variable Rate Secured Debt [Member]
Variable Rate Secured Debt
Proceeds from sale of properties
Proceeds from Sale, Real Estate, Held-for-Investment
2026
Sales-Type and Direct Financing Leases, Payment to be Received, Year One
Common Units
Common Units [Member]
Common units representing ownership interest in the operating partnership.
Interest rate swap, effective February 1, 2023
Interest Rate Swap, Effective February 2023 3.742% [Member]
Interest Rate Swap, Effective February 2023 3.742%
Termination Date
Trading Arrangement Termination Date
Insider Trading Policies and Procedures Adopted
Insider Trading Policies and Procedures Adopted [Flag]
5850 University Research Court
5850 University Research Court [Member]
Represents the information pertaining to 5850 University Research Court, an office property owned by the entity.
Receivable Type [Domain]
Receivable [Domain]
1550 West Nursery Road
1550 West Nursery Road [Member]
Represents the information pertaining to 1550 West Nursery Road, an office property owned by the entity.
Operating leases, weighted average discount rate
Operating Lease, Weighted Average Discount Rate, Percent
Unvested shares that are expected to vest (in dollars per share or unit)
Share-based Compensation Arrangement by Share-based Payment Award Equity Instruments Other than Options Expected to Vest Outstanding Weighted Average Grant Date Fair Value
Represents the weighted average grant date fair value of expected to vest equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.
Denominator for basic EPS (common shares) (in shares)
Weighted Average Number of Shares Outstanding, Basic
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table]
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table]
PSU Grants 2021
PSU Grants 2021 [Member]
PSU Grants 2021
Schedule of Calculation of Numerator and Denominator in Basic and Diluted Earnings Per Share
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
Change in Contract with Customer, Liability
Change in Contract with Customer, Liability [Abstract]
Optional renewal term
Lessee, Renewal Term, Optional
Lessee, Lease Renewal Term, Optional
Adjustments to noncontrolling interests resulting from changes in ownership of CDPLP
Noncontrolling Interest, Increase (Decrease) From Changes In Ownership
Noncontrolling Interest, Increase (Decrease) From Changes In Ownership
Segment Reporting [Abstract]
Segment Reporting [Abstract]
M Square Associates, LLC
M Square Associates, LLC
M Square Associates LLC [Member]
Represents the investment in M Square Associates, LLC, a consolidated joint venture.
Debt Disclosure [Abstract]
Debt Disclosure [Abstract]
14900 Conference Center Drive
14900 Conference Center Drive [Member]
Represents the information pertaining to 14900 Conference Center Drive, an office property owned by the entity.
Write-offs
Accounts Receivable, Allowance for Credit Loss, Writeoff
Unamortized discounts and/or commissions included in carrying value
Debt Instrument, Unamortized Discount
Forgone Recovery due to Expense of Enforcement, Amount
Forgone Recovery due to Expense of Enforcement, Amount
Variable-rate debt
Variable Rate Debt [Member]
Variable Rate Debt
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Consolidated Entities [Axis]
Consolidated Entities [Axis]
Common shares of beneficial interest, par value (in dollars per share)
Common Stock, Par or Stated Value Per Share
46579 Expedition Drive
46579 Expedition Drive [Member]
Represents the information pertaining to 46579 Expedition Drive, an office property owned by the entity.
Reconciliation of segment revenues to total revenues
Segment Reporting Revenue Reconciling Item [Abstract]
UJV NOI allocable to COPT Defense
UJV NOI allocable to COPT Defense
UJV NOI allocable to COPT Defense included in equity in income (loss) of unconsolidated entities
Unconsolidated Joint Venture Net Operating Income Allocable to Parent
Unconsolidated Joint Venture Net Operating Income Allocable to Parent
Impairment charges
Impairment of Real Estate
Use of Estimates in the Preparation of Financial Statements
Use of Estimates, Policy [Policy Text Block]
Adjustments to noncontrolling interests resulting from changes in CDPLP ownership
Equity Change Adjustments to Additional Paid in Capital Reallocation of Minority Interest
Adjustments to additional paid in capital as a result of a reallocation of a subsidiary's stockholders' equity to noncontrolling interest due to the subsidiary issuing stock. This reallocation is from a capital transaction.
Operating cash flows for finance leases
Finance Lease, Interest Payment on Liability
Comprehensive income (loss)
Comprehensive Income (Loss), Net of Tax, After Redeemable Noncontrolling Interest Adjustments
Comprehensive Income (Loss), Net of Tax, After Redeemable Noncontrolling Interest Adjustments
Net investment in sales-type leases
Sales-type and Direct Financing Leases, Lease Receivable
Insider Trading Arrangements [Line Items]
Credit Agreement
Credit Agreement [Member]
Credit Agreement
Redemption of common units
Partners' Capital Account, Redemptions
939 Elkridge Landing Road
939 Elkridge Landing Road [Member]
Represents the information pertaining to 939 Elkridge Landing Road, an office property owned by the entity.
Distributions to noncontrolling interests in other consolidated entities
Minority Interest Decrease From Distributions Including Joint Ventures
Decrease in noncontrolling interest balance as a result of distributions to equity interests owned by noncontrolling shareholders, partners, or other equity holders in joint ventures included in the entity's consolidated financial statements.
Anne Arundel County, Maryland
Anne Arundel County, Maryland [Member]
Anne Arundel County, Maryland [Member]
Total liabilities
Total Liabilities
Liabilities
Antidilutive Securities, Name [Domain]
Antidilutive Securities, Name [Domain]
Commitment fee percentage
Line of Credit Facility, Commitment Fee Percentage
45310 Abell House Lane
45310 Abell House Lane [Member]
Represents the information pertaining to 45310 Abell House Lane, an office property owned by the entity.
2030
Finance Lease, Liability, to be Paid, Year Five
Pension Adjustments Prior Service Cost
Pension Adjustments Prior Service Cost [Member]
Material Terms of Trading Arrangement
Material Terms of Trading Arrangement [Text Block]
Consolidation Items [Axis]
Consolidation Items [Axis]
Leasing costs paid
Payments for Leasing Costs
Partner's capital account upon formation
Partner's Capital Account Upon Formation
Represents the amount credited to the partner's capital upon formation.
Counterparty Name [Axis]
Counterparty Name [Axis]
Threshold trading days
Debt Instrument, Convertible, Threshold Trading Days
Entity Incorporation, State or Country Code
Entity Incorporation, State or Country Code
Non-NEOs
Non-NEOs [Member]
Data Center Shells in Northern Virginia
Data Center Shells in Northern Virginia [Member]
Data Center Shells in Northern Virginia [Member]