| Schedule III-Real Estate and Accumulated Depreciation |
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Initial Cost | | Gross Amounts Carried
At Close of Period | | | | | Property (Type) (1) | Location | Encumbrances (2) | Land | Building
and Land Improvements | Costs Capitalized Subsequent to Acquisition | Land | Building
and Land Improvements | Total
(3) | Accumulated Depreciation (4) | Year Built or Renovated | Date Acquired (5) | | 100 Light Street (O) | Baltimore, MD | $ | — | | $ | 6,720 | | $ | 31,215 | | $ | 35,419 | | $ | 6,720 | | $ | 66,634 | | $ | 73,354 | | $ | (42,607) | | 1973/2011 | 8/7/2015 | | 100 Secured Gateway (O) | Huntsville, AL | — | | — | | 71,180 | | 122 | | — | | 71,302 | | 71,302 | | (9,493) | | 2020 | 3/23/2010 | | 1000 Redstone Gateway (O) | Huntsville, AL | — | | — | | 20,533 | | 216 | | — | | 20,749 | | 20,749 | | (6,619) | | 2013 | 3/23/2010 | | 1100 Redstone Gateway (O) | Huntsville, AL | — | | — | | 19,593 | | 5,018 | | — | | 24,611 | | 24,611 | | (6,622) | | 2014 | 3/23/2010 | | 114 National Business Parkway (O) | Annapolis Junction, MD | — | | 364 | | 3,109 | | 433 | | 364 | | 3,542 | | 3,906 | | (2,086) | | 2002 | 6/30/2000 | | 1200 Redstone Gateway (O) | Huntsville, AL | — | | — | | 22,389 | | 14,883 | | — | | 37,272 | | 37,272 | | (9,943) | | 2013 | 3/23/2010 | | 1201 M Street SE (O) | Washington, DC | — | | — | | 49,775 | | 19,924 | | — | | 69,699 | | 69,699 | | (29,719) | | 2001 | 9/28/2010 | | 1201 Winterson Road (O) | Linthicum, MD | — | | 2,130 | | 17,769 | | 1,210 | | 2,130 | | 18,979 | | 21,109 | | (7,739) | | 1985/2017 | 4/30/1998 | | 1220 12th Street SE (O) | Washington, DC | — | | — | | 42,464 | | 13,640 | | — | | 56,104 | | 56,104 | | (26,813) | | 2003 | 9/28/2010 | | 1243 Winterson Road (L) | Linthicum, MD | — | | 630 | | — | | — | | 630 | | — | | 630 | | — | | (6) | 12/19/2001 | | 131 National Business Parkway (O) | Annapolis Junction, MD | — | | 1,906 | | 7,623 | | 6,879 | | 1,906 | | 14,502 | | 16,408 | | (10,632) | | 1990 | 9/28/1998 | | 132 National Business Parkway (O) | Annapolis Junction, MD | — | | 2,917 | | 12,259 | | 5,041 | | 2,917 | | 17,300 | | 20,217 | | (12,579) | | 2000 | 5/28/1999 | | 133 National Business Parkway (O) | Annapolis Junction, MD | — | | 2,517 | | 10,068 | | 7,235 | | 2,517 | | 17,303 | | 19,820 | | (12,906) | | 1997 | 9/28/1998 | | 134 National Business Parkway (O) | Annapolis Junction, MD | — | | 3,684 | | 7,517 | | 6,467 | | 3,684 | | 13,984 | | 17,668 | | (10,552) | | 1999 | 11/13/1998 | | 1340 Ashton Road (O) | Hanover, MD | — | | 905 | | 3,620 | | 3,147 | | 905 | | 6,767 | | 7,672 | | (4,391) | | 1989 | 4/28/1999 | | 13450 Sunrise Valley Drive (O) | Herndon, VA | — | | 1,386 | | 5,576 | | 9,554 | | 1,386 | | 15,130 | | 16,516 | | (8,095) | | 1998 | 7/25/2003 | | 13454 Sunrise Valley Drive (O) | Herndon, VA | — | | 2,847 | | 11,986 | | 15,610 | | 2,847 | | 27,596 | | 30,443 | | (17,372) | | 1998 | 7/25/2003 | | 135 National Business Parkway (O) | Annapolis Junction, MD | — | | 2,484 | | 9,750 | | 7,643 | | 2,484 | | 17,393 | | 19,877 | | (13,076) | | 1998 | 12/30/1998 | | 1362 Mellon Road (O) | Hanover, MD | — | | 950 | | 3,864 | | 3,528 | | 950 | | 7,392 | | 8,342 | | (3,457) | | 2006 | 2/10/2006 | | 13857 McLearen Road (O) | Herndon, VA | — | | 3,507 | | 30,177 | | 9,894 | | 3,507 | | 40,071 | | 43,578 | | (18,178) | | 2007 | 7/11/2012 | | 140 National Business Parkway (O) | Annapolis Junction, MD | — | | 3,407 | | 24,167 | | 3,022 | | 3,407 | | 27,189 | | 30,596 | | (14,667) | | 2003 | 12/31/2003 | | 141 National Business Parkway (O) | Annapolis Junction, MD | — | | 2,398 | | 9,538 | | 7,581 | | 2,398 | | 17,119 | | 19,517 | | (11,275) | | 1990 | 9/28/1998 | | 14280 Park Meadow Drive (O) | Chantilly, VA | — | | 3,731 | | 15,953 | | 7,494 | | 3,731 | | 23,447 | | 27,178 | | (14,348) | | 1999 | 9/29/2004 | | 14840 Conference Center Drive (O) | Chantilly, VA | — | | 1,572 | | 8,175 | | 6,394 | | 1,572 | | 14,569 | | 16,141 | | (10,010) | | 2000 | 7/25/2003 | | 14850 Conference Center Drive (O) | Chantilly, VA | — | | 1,615 | | 8,358 | | 8,367 | | 1,615 | | 16,725 | | 18,340 | | (10,379) | | 2000 | 7/25/2003 | | 14900 Conference Center Drive (O) | Chantilly, VA | — | | 3,436 | | 14,402 | | 14,022 | | 3,436 | | 28,424 | | 31,860 | | (17,066) | | 1999 | 7/25/2003 | | 1501 South Clinton Street (O) | Baltimore, MD | — | | 13,137 | | 20,753 | | 51,243 | | 13,137 | | 71,996 | | 85,133 | | (43,562) | | 2006 | 10/27/2009 | | 15049 Conference Center Drive (O) | Chantilly, VA | — | | 4,415 | | 20,365 | | 18,984 | | 4,415 | | 39,349 | | 43,764 | | (27,741) | | 1997 | 8/14/2002 | | 15050 Conference Center Drive (O) | Chantilly, VA | — | | 10,943 | | 9,357 | | 48 | | 10,943 | | 9,405 | | 20,348 | | (109) | | 2000 | 10/30/2025 | | 15059 Conference Center Drive (O) | Chantilly, VA | — | | 5,753 | | 13,615 | | 9,681 | | 5,753 | | 23,296 | | 29,049 | | (14,142) | | 2000 | 8/14/2002 | | 1550 West Nursery Road (O) | Linthicum, MD | — | | 14,071 | | 16,930 | | — | | 14,071 | | 16,930 | | 31,001 | | (8,151) | | 2009 | 10/28/2009 | | 1560 West Nursery Road (O) | Linthicum, MD | — | | 1,441 | | 113 | | — | | 1,441 | | 113 | | 1,554 | | (33) | | 2014 | 10/28/2009 | | 1610 West Nursery Road (O) | Linthicum, MD | — | | 259 | | 246 | | — | | 259 | | 246 | | 505 | | (54) | | 2016 | 4/30/1998 | | 1616 West Nursery Road (O) | Linthicum, MD | — | | 393 | | 3,323 | | 90 | | 393 | | 3,413 | | 3,806 | | (720) | | 2017 | 4/30/1998 | | 1622 West Nursery Road (O) | Linthicum, MD | — | | 393 | | 2,542 | | — | | 393 | | 2,542 | | 2,935 | | (564) | | 2016 | 4/30/1998 | | 16442 Commerce Drive (O) | Dahlgren, VA | — | | 613 | | 2,582 | | 1,268 | | 613 | | 3,850 | | 4,463 | | (2,466) | | 2002 | 12/21/2004 | | 16480 Commerce Drive (O) | Dahlgren, VA | — | | 1,856 | | 7,425 | | 3,796 | | 1,856 | | 11,221 | | 13,077 | | (6,477) | | 2000 | 12/28/2004 |
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Initial Cost | | Gross Amounts Carried
At Close of Period | | | | | Property (Type) (1) | Location | Encumbrances (2) | Land | Building
and Land Improvements | Costs Capitalized Subsequent to Acquisition | Land | Building
and Land Improvements | Total
(3) | Accumulated Depreciation (4) | Year Built or Renovated | Date Acquired (5) | | 16501 Commerce Drive (O) | Dahlgren, VA | — | | 522 | | 2,090 | | 1,932 | | 522 | | 4,022 | | 4,544 | | (2,140) | | 2002 | 12/21/2004 | | 16539 Commerce Drive (O) | Dahlgren, VA | — | | 688 | | 2,860 | | 2,640 | | 688 | | 5,500 | | 6,188 | | (3,620) | | 1990 | 12/21/2004 | | 16541 Commerce Drive (O) | Dahlgren, VA | — | | 773 | | 3,094 | | 2,717 | | 773 | | 5,811 | | 6,584 | | (3,966) | | 1996 | 12/21/2004 | | 16543 Commerce Drive (O) | Dahlgren, VA | — | | 436 | | 1,742 | | 992 | | 436 | | 2,734 | | 3,170 | | (1,722) | | 2002 | 12/21/2004 | | 1751 Pinnacle Drive (O) | McLean, VA | — | | 4,762 | | 26,046 | | 36,351 | | 4,762 | | 62,397 | | 67,159 | | (51,619) | | 1989/1995 | 9/23/2004 | | 1753 Pinnacle Drive (O) | McLean, VA | — | | 3,729 | | 21,500 | | 28,793 | | 3,729 | | 50,293 | | 54,022 | | (37,196) | | 1976/2004 | 9/23/2004 | | 206 Research Boulevard (O) | Aberdeen, MD | — | | — | | — | | — | | — | | — | | — | | — | | 2012 | 9/14/2007 | | 209 Research Boulevard (O) | Aberdeen, MD | — | | 134 | | 1,711 | | 1,135 | | 134 | | 2,846 | | 2,980 | | (1,174) | | 2010 | 9/14/2007 | | 210 Research Boulevard (O) | Aberdeen, MD | — | | 113 | | 2,644 | | 663 | | 113 | | 3,307 | | 3,420 | | (929) | | 2010 | 9/14/2007 | | 2100 L Street (O) | Washington, DC | — | | 41,935 | | 80,720 | | — | | 41,935 | | 80,720 | | 122,655 | | (10,371) | | 2020 | 8/11/2015 | | 2100 Rideout Road (O) | Huntsville, AL | — | | — | | 7,343 | | 3,652 | | — | | 10,995 | | 10,995 | | (4,300) | | 2016 | 3/23/2010 | | 22289 Exploration Drive (O) | Lexington Park, MD | — | | 1,422 | | 5,719 | | 2,724 | | 1,422 | | 8,443 | | 9,865 | | (5,397) | | 2000 | 3/24/2004 | | 22299 Exploration Drive (O) | Lexington Park, MD | — | | 1,278 | | 5,791 | | 3,089 | | 1,278 | | 8,880 | | 10,158 | | (6,139) | | 1998 | 3/24/2004 | | 22300 Exploration Drive (O) | Lexington Park, MD | — | | 1,094 | | 5,038 | | 3,073 | | 1,094 | | 8,111 | | 9,205 | | (5,517) | | 1997 | 11/9/2004 | | 22309 Exploration Drive (O) | Lexington Park, MD | — | | 2,160 | | 10,419 | | 13,103 | | 2,160 | | 23,522 | | 25,682 | | (11,838) | | 1984/1997 | 3/24/2004 | | 23535 Cottonwood Parkway (O) | California, MD | — | | 692 | | 3,051 | | 1,402 | | 692 | | 4,453 | | 5,145 | | (2,872) | | 1984 | 3/24/2004 | | 250 W Pratt St (O) | Baltimore, MD | — | | 4,704 | | 21,487 | | 24,717 | | 4,704 | | 46,204 | | 50,908 | | (30,226) | | 1985 | 3/19/2015 | | 2600 Park Tower Drive (O) | Vienna, VA | — | | 20,078 | | 34,443 | | 19,174 | | 20,078 | | 53,617 | | 73,695 | | (15,864) | | 1999 | 4/15/2015 | | 2691 Technology Drive (O) | Annapolis Junction, MD | — | | 2,098 | | 17,334 | | 9,198 | | 2,098 | | 26,532 | | 28,630 | | (15,921) | | 2005 | 5/26/2000 | | 2701 Technology Drive (O) | Annapolis Junction, MD | — | | 1,737 | | 15,266 | | 8,714 | | 1,737 | | 23,980 | | 25,717 | | (16,493) | | 2001 | 5/26/2000 | | 2711 Technology Drive (O) | Annapolis Junction, MD | — | | 2,251 | | 21,611 | | 7,199 | | 2,251 | | 28,810 | | 31,061 | | (18,355) | | 2002 | 11/13/2000 | | 2720 Technology Drive (O) | Annapolis Junction, MD | 14,350 | | 3,863 | | 29,272 | | 3,264 | | 3,863 | | 32,536 | | 36,399 | | (18,250) | | 2004 | 1/31/2002 | | 2721 Technology Drive (O) | Annapolis Junction, MD | — | | 4,611 | | 14,597 | | 6,042 | | 4,611 | | 20,639 | | 25,250 | | (13,146) | | 2000 | 10/21/1999 | | 2730 Hercules Road (O) | Annapolis Junction, MD | 24,208 | | 8,737 | | 31,612 | | 13,775 | | 8,737 | | 45,387 | | 54,124 | | (28,840) | | 1990 | 9/28/1998 | | 30 Light Street (O) | Baltimore, MD | — | | — | | 2,501 | | 734 | | — | | 3,235 | | 3,235 | | (3,112) | | 2009 | 8/7/2015 | | 300 Secured Gateway (O) | Huntsville, AL | — | | — | | 64,364 | | 39 | | — | | 64,403 | | 64,403 | | (3,609) | | 2023 | 3/23/2010 | | 300 Sentinel Drive (O) | Annapolis Junction, MD | — | | 1,517 | | 59,165 | | 3,729 | | 1,517 | | 62,894 | | 64,411 | | (25,918) | | 2009 | 11/14/2003 | | 302 Sentinel Drive (O) | Annapolis Junction, MD | — | | 2,648 | | 29,687 | | 8,215 | | 2,648 | | 37,902 | | 40,550 | | (17,257) | | 2007 | 11/14/2003 | | 304 Sentinel Drive (O) | Annapolis Junction, MD | — | | 3,411 | | 24,917 | | 5,722 | | 3,411 | | 30,639 | | 34,050 | | (17,120) | | 2005 | 11/14/2003 | | 306 Sentinel Drive (O) | Annapolis Junction, MD | — | | 3,260 | | 22,592 | | 4,238 | | 3,260 | | 26,830 | | 30,090 | | (13,695) | | 2006 | 11/14/2003 | | 308 Sentinel Drive (O) | Annapolis Junction, MD | — | | 1,422 | | 26,208 | | 2,371 | | 1,422 | | 28,579 | | 30,001 | | (11,400) | | 2010 | 11/14/2003 | | 310 Sentinel Way (O) | Annapolis Junction, MD | 14,500 | | 2,372 | | 50,750 | | 781 | | 2,372 | | 51,531 | | 53,903 | | (10,867) | | 2016 | 11/14/2003 | | 310 The Bridge Street (O) | Huntsville, AL | — | | 261 | | 26,530 | | 10,487 | | 261 | | 37,017 | | 37,278 | | (16,991) | | 2009 | 8/9/2011 | | 312 Sentinel Way (O) | Annapolis Junction, MD | — | | 3,138 | | 27,797 | | 5 | | 3,138 | | 27,802 | | 30,940 | | (7,863) | | 2014 | 11/14/2003 | | 314 Sentinel Way (O) | Annapolis Junction, MD | — | | 1,254 | | 7,741 | | 2 | | 1,254 | | 7,743 | | 8,997 | | (2,413) | | 2008 | 11/14/2003 | | 316 Sentinel Way (O) | Annapolis Junction, MD | — | | 2,748 | | 38,156 | | 288 | | 2,748 | | 38,444 | | 41,192 | | (13,306) | | 2011 | 11/14/2003 | | 318 Sentinel Way (O) | Annapolis Junction, MD | 12,702 | | 2,185 | | 28,426 | | 573 | | 2,185 | | 28,999 | | 31,184 | | (14,555) | | 2005 | 11/14/2003 |
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Initial Cost | | Gross Amounts Carried
At Close of Period | | | | | Property (Type) (1) | Location | Encumbrances (2) | Land | Building
and Land Improvements | Costs Capitalized Subsequent to Acquisition | Land | Building
and Land Improvements | Total
(3) | Accumulated Depreciation (4) | Year Built or Renovated | Date Acquired (5) | | 320 Sentinel Way (O) | Annapolis Junction, MD | — | | 2,067 | | 21,623 | | 156 | | 2,067 | | 21,779 | | 23,846 | | (9,849) | | 2007 | 11/14/2003 | | 322 Sentinel Way (O) | Annapolis Junction, MD | — | | 2,605 | | 22,827 | | 2,849 | | 2,605 | | 25,676 | | 28,281 | | (12,373) | | 2006 | 11/14/2003 | | 324 Sentinel Way (O) | Annapolis Junction, MD | — | | 1,656 | | 23,018 | | 81 | | 1,656 | | 23,099 | | 24,755 | | (8,852) | | 2010 | 6/29/2006 | | 340th Trail (L) | Van Meter, IA | 6,747 | | 32,852 | | 3,266 | | — | | 32,852 | | 3,266 | | 36,118 | | — | | (6) | 9/27/2024 | | 3900 Rogers Road (O) | San Antonio, TX | — | | 2,932 | | 14,101 | | 1,259 | | 2,932 | | 15,360 | | 18,292 | | (441) | | 2005 | 9/26/2024 | | 400 National Business Parkway (O) | Annapolis Junction, MD | 6,871 | | — | | 49,788 | | 11 | | — | | 49,799 | | 49,799 | | (190) | | (7) | 6/29/2006 | | 4000 Market Street (O) | Huntsville, AL | — | | — | | 9,198 | | 2,603 | | — | | 11,801 | | 11,801 | | (2,166) | | 2018 | 3/23/2010 | | 410 National Business Parkway (O) | Annapolis Junction, MD | — | | 1,831 | | 23,257 | | 4,174 | | 1,831 | | 27,431 | | 29,262 | | (9,835) | | 2012 | 6/29/2006 | | 4100 Market Street (O) | Huntsville, AL | — | | — | | 8,046 | | 31 | | — | | 8,077 | | 8,077 | | (1,323) | | 2019 | 3/23/2010 | | 420 National Business Parkway (O) | Annapolis Junction, MD | — | | 2,370 | | 31,609 | | 4,529 | | 2,370 | | 36,138 | | 38,508 | | (9,670) | | 2013 | 6/29/2006 | | 430 National Business Parkway (O) | Annapolis Junction, MD | — | | 1,852 | | 21,563 | | 5,185 | | 1,852 | | 26,748 | | 28,600 | | (9,790) | | 2011 | 6/29/2006 | | 4400 River Road (O) | College Park, MD | — | | — | | 4,367 | | — | | — | | 4,367 | | 4,367 | | — | | (7) | 1/29/2008 | | 44408 Pecan Court (O) | California, MD | — | | 817 | | 1,583 | | 2,432 | | 817 | | 4,015 | | 4,832 | | (2,711) | | 1986 | 3/24/2004 | | 44414 Pecan Court (O) | California, MD | — | | 405 | | 1,619 | | 1,231 | | 405 | | 2,850 | | 3,255 | | (2,261) | | 1986 | 3/24/2004 | | 44417 Pecan Court (O) | California, MD | — | | 434 | | 3,822 | | 322 | | 434 | | 4,144 | | 4,578 | | (2,973) | | 1989/2015 | 3/24/2004 | | 44420 Pecan Court (O) | California, MD | — | | 344 | | 890 | | 418 | | 344 | | 1,308 | | 1,652 | | (862) | | 1989 | 11/9/2004 | | 44425 Pecan Court (O) | California, MD | — | | 1,309 | | 3,506 | | 3,090 | | 1,309 | | 6,596 | | 7,905 | | (4,846) | | 1997 | 5/5/2004 | | 45310 Abell House Lane (O) | California, MD | — | | 2,272 | | 13,808 | | 3,149 | | 2,272 | | 16,957 | | 19,229 | | (6,462) | | 2011 | 8/30/2010 | | 4600 River Road (O) | College Park, MD | — | | — | | 28,620 | | 144 | | — | | 28,764 | | 28,764 | | (3,108) | | 2020 | 1/29/2008 | | 46579 Expedition Drive (O) | Lexington Park, MD | — | | 1,406 | | 5,796 | | 3,228 | | 1,406 | | 9,024 | | 10,430 | | (5,781) | | 2002 | 3/24/2004 | | 46591 Expedition Drive (O) | Lexington Park, MD | — | | 1,200 | | 7,199 | | 5,231 | | 1,200 | | 12,430 | | 13,630 | | (6,910) | | 2005 | 3/24/2004 | | 4851 Stonecroft Boulevard (O) | Chantilly, VA | — | | 1,878 | | 11,558 | | 1,381 | | 1,878 | | 12,939 | | 14,817 | | (6,583) | | 2004 | 8/14/2002 | | 5300 Redstone Gateway (O) | Huntsville, AL | — | | — | | 21,301 | | 6 | | — | | 21,307 | | 21,307 | | (912) | | 2024 | 3/23/2010 | | 540 National Business Parkway (O) | Annapolis Junction, MD | — | | 2,035 | | 36,284 | | 233 | | 2,035 | | 36,517 | | 38,552 | | (6,854) | | 2017 | 6/29/2006 | | 550 National Business Parkway (O) | Annapolis Junction, MD | — | | 2,678 | | 62,031 | | 21 | | 2,678 | | 62,052 | | 64,730 | | (2,661) | | 2023 | 6/29/2006 | | 5520 Research Park Drive (O) | Catonsville, MD | — | | — | | 20,072 | | 2,458 | | — | | 22,530 | | 22,530 | | (9,882) | | 2009 | 4/4/2006 | | 5522 Research Park Drive (O) | Catonsville, MD | — | | — | | 4,550 | | 996 | | — | | 5,546 | | 5,546 | | (2,615) | | 2007 | 3/8/2006 | | 560 National Business Parkway (O) | Annapolis Junction, MD | — | | 2,193 | | 67,249 | | 10 | | 2,193 | | 67,259 | | 69,452 | | (4,516) | | 2022 | 6/29/2006 | | 5801 University Research Court (O) | College Park, MD | 10,160 | | — | | 17,431 | | 170 | | — | | 17,601 | | 17,601 | | (3,590) | | 2018 | 1/29/2008 | | 5825 University Research Court (O) | College Park, MD | 17,531 | | — | | 22,771 | | 4,095 | | — | | 26,866 | | 26,866 | | (11,661) | | 2008 | 1/29/2008 | | 5850 University Research Court (O) | College Park, MD | 18,548 | | — | | 31,906 | | 1,112 | | — | | 33,018 | | 33,018 | | (13,306) | | 2008 | 1/29/2008 | | 6000 Redstone Gateway (O) | Huntsville, AL | — | | — | | 8,542 | | 41 | | — | | 8,583 | | 8,583 | | (1,072) | | 2020 | 3/23/2010 | | 610 Guardian Way (O) | Annapolis Junction, MD | — | | 7,636 | | 54,088 | | — | | 7,636 | | 54,088 | | 61,724 | | (5,618) | | 2021 | 6/29/2006 | | 6200 Redstone Gateway (O) | Huntsville, AL | — | | — | | 52,179 | | 60 | | — | | 52,239 | | 52,239 | | (4,346) | | 2022 | 3/23/2010 | | 6700 Alexander Bell Drive (O) | Columbia, MD | — | | 1,755 | | 7,019 | | 11,329 | | 1,755 | | 18,348 | | 20,103 | | (12,497) | | 1988 | 5/14/2001 | | 6708 Alexander Bell Drive (O) | Columbia, MD | — | | 897 | | 12,693 | | 2,022 | | 897 | | 14,715 | | 15,612 | | (6,080) | | 1988/2016 | 5/14/2001 | | 6711 Columbia Gateway Drive (O) | Columbia, MD | — | | 2,683 | | 23,239 | | 3,928 | | 2,683 | | 27,167 | | 29,850 | | (13,290) | | 2006-2007 | 9/28/2000 |
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Initial Cost | | Gross Amounts Carried
At Close of Period | | | | | Property (Type) (1) | Location | Encumbrances (2) | Land | Building
and Land Improvements | Costs Capitalized Subsequent to Acquisition | Land | Building
and Land Improvements | Total
(3) | Accumulated Depreciation (4) | Year Built or Renovated | Date Acquired (5) | | 6716 Alexander Bell Drive (O) | Columbia, MD | — | | 1,242 | | 4,969 | | 10,242 | | 1,242 | | 15,211 | | 16,453 | | (8,389) | | 1990 | 12/31/1998 | | 6721 Columbia Gateway Drive (O) | Columbia, MD | — | | 1,753 | | 34,090 | | 14,851 | | 1,753 | | 48,941 | | 50,694 | | (19,283) | | 2009 | 9/28/2000 | | 6724 Alexander Bell Drive (O) | Columbia, MD | — | | 449 | | 5,039 | | 2,739 | | 449 | | 7,778 | | 8,227 | | (5,223) | | 2001 | 5/14/2001 | | 6731 Columbia Gateway Drive (O) | Columbia, MD | — | | 2,807 | | 19,098 | | 7,962 | | 2,807 | | 27,060 | | 29,867 | | (17,724) | | 2002 | 3/29/2000 | | 6740 Alexander Bell Drive (O) | Columbia, MD | — | | 1,424 | | 4,209 | | 10,583 | | 1,424 | | 14,792 | | 16,216 | | (4,835) | | 1992 | 12/31/1998 | | 6741 Columbia Gateway Drive (O) | Columbia, MD | — | | 675 | | 1,711 | | 528 | | 675 | | 2,239 | | 2,914 | | (934) | | 2008 | 9/28/2000 | | 6750 Alexander Bell Drive (O) | Columbia, MD | — | | 1,263 | | 12,461 | | 6,077 | | 1,263 | | 18,538 | | 19,801 | | (13,441) | | 2001 | 12/31/1998 | | 6760 Alexander Bell Drive (O) | Columbia, MD | — | | 890 | | 3,561 | | 4,277 | | 890 | | 7,838 | | 8,728 | | (6,013) | | 1991 | 12/31/1998 | | 6841 Benjamin Franklin Drive (O) | Columbia, MD | — | | 5,429 | | 2,534 | | 6,652 | | 5,429 | | 9,186 | | 14,615 | | (1,745) | | 2008 | 3/15/2024 | | 6940 Columbia Gateway Drive (O) | Columbia, MD | — | | 3,545 | | 9,916 | | 13,691 | | 3,545 | | 23,607 | | 27,152 | | (16,169) | | 1999 | 11/13/1998 | | 6950 Columbia Gateway Drive (O) | Columbia, MD | — | | 3,596 | | 28,283 | | 4,459 | | 3,596 | | 32,742 | | 36,338 | | (15,630) | | 1998/2019 | 10/22/1998 | | 7000 Columbia Gateway Drive (O) | Columbia, MD | — | | 3,131 | | 12,103 | | 12,618 | | 3,131 | | 24,721 | | 27,852 | | (15,466) | | 1999 | 5/31/2002 | | 7000 Redstone Gateway (O) | Huntsville, AL | — | | — | | 10,026 | | 34 | | — | | 10,060 | | 10,060 | | (745) | | 2022 | 3/23/2010 | | 7005 Columbia Gateway Drive (L) | Columbia, MD | — | | 3,036 | | 747 | | — | | 3,036 | | 747 | | 3,783 | | — | | (6) | 6/26/2014 | | 7015 Albert Einstein Drive (O) | Columbia, MD | — | | 2,058 | | 6,093 | | 3,701 | | 2,058 | | 9,794 | | 11,852 | | (6,287) | | 1999 | 12/1/2005 | | 7061 Columbia Gateway Drive (O) | Columbia, MD | — | | 729 | | 3,094 | | 3,027 | | 729 | | 6,121 | | 6,850 | | (4,304) | | 2000 | 8/30/2001 | | 7063 Columbia Gateway Drive (O) | Columbia, MD | — | | 902 | | 3,684 | | 3,712 | | 902 | | 7,396 | | 8,298 | | (5,490) | | 2000 | 8/30/2001 | | 7065 Columbia Gateway Drive (O) | Columbia, MD | — | | 919 | | 3,763 | | 4,011 | | 919 | | 7,774 | | 8,693 | | (5,480) | | 2000 | 8/30/2001 | | 7067 Columbia Gateway Drive (O) | Columbia, MD | — | | 1,829 | | 11,823 | | 10,747 | | 1,829 | | 22,570 | | 24,399 | | (13,289) | | 2001 | 8/30/2001 | | 7100 Redstone Gateway (O) | Huntsville, AL | — | | — | | 12,983 | | 48 | | — | | 13,031 | | 13,031 | | (1,490) | | 2021 | 3/23/2010 | | 7125 Columbia Gateway Drive (O) | Columbia, MD | — | | 20,487 | | 49,926 | | 35,038 | | 20,487 | | 84,964 | | 105,451 | | (42,753) | | 1973/1999 | 6/29/2006 | | 7130 Columbia Gateway Drive (O) | Columbia, MD | — | | 1,350 | | 4,359 | | 3,187 | | 1,350 | | 7,546 | | 8,896 | | (5,110) | | 1989 | 9/19/2005 | | 7134 Columbia Gateway Drive (O) | Columbia, MD | — | | 704 | | 4,700 | | 963 | | 704 | | 5,663 | | 6,367 | | (2,647) | | 1990/2016 | 9/19/2005 | | 7138 Columbia Gateway Drive (O) | Columbia, MD | — | | 1,104 | | 3,518 | | 3,406 | | 1,104 | | 6,924 | | 8,028 | | (4,943) | | 1990 | 9/19/2005 | | 7142 Columbia Gateway Drive (O) | Columbia, MD | — | | 1,342 | | 7,148 | | 4,245 | | 1,342 | | 11,393 | | 12,735 | | (6,222) | | 1994/2018 | 9/19/2005 | | 7150 Columbia Gateway Drive (O) | Columbia, MD | — | | 1,032 | | 3,429 | | 1,829 | | 1,032 | | 5,258 | | 6,290 | | (2,855) | | 1991 | 9/19/2005 | | 7150 Riverwood Drive (O) | Columbia, MD | — | | 1,821 | | 4,388 | | 16,249 | | 1,821 | | 20,637 | | 22,458 | | (5,331) | | 2000 | 1/10/2007 | | 7160 Riverwood Drive (O) | Columbia, MD | — | | 2,732 | | 7,006 | | 4,841 | | 2,732 | | 11,847 | | 14,579 | | (7,272) | | 2000 | 1/10/2007 | | 7170 Riverwood Drive (O) | Columbia, MD | — | | 1,283 | | 3,096 | | 2,624 | | 1,283 | | 5,720 | | 7,003 | | (3,607) | | 2000 | 1/10/2007 | | 7175 Riverwood Drive (O) | Columbia, MD | — | | 1,788 | | 7,269 | | 145 | | 1,788 | | 7,414 | | 9,202 | | (2,225) | | 1996/2013 | 7/27/2005 | | 7200 Redstone Gateway (O) | Huntsville, AL | — | | — | | 8,348 | | 272 | | — | | 8,620 | | 8,620 | | (2,500) | | 2013 | 3/23/2010 | | 7200 Riverwood Drive (O) | Columbia, MD | — | | 4,089 | | 22,630 | | 6,090 | | 4,089 | | 28,720 | | 32,809 | | (16,743) | | 1986 | 10/13/1998 | | 7205 Riverwood Drive (O) | Columbia, MD | — | | 1,367 | | 21,419 | | 420 | | 1,367 | | 21,839 | | 23,206 | | (6,697) | | 2013 | 7/27/2005 | | 7272 Park Circle Drive (O) | Hanover, MD | — | | 1,479 | | 6,300 | | 5,305 | | 1,479 | | 11,605 | | 13,084 | | (7,534) | | 1991/1996 | 1/10/2007 | | 7318 Parkway Drive (O) | Hanover, MD | — | | 972 | | 3,888 | | 2,410 | | 972 | | 6,298 | | 7,270 | | (4,044) | | 1984 | 4/16/1999 | | 7400 Redstone Gateway (O) | Huntsville, AL | — | | — | | 9,223 | | 253 | | — | | 9,476 | | 9,476 | | (2,470) | | 2015 | 3/23/2010 | | 7467 Ridge Road (O) | Hanover, MD | — | | 1,565 | | 3,116 | | 7,987 | | 1,565 | | 11,103 | | 12,668 | | (6,951) | | 1990 | 4/28/1999 |
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Initial Cost | | Gross Amounts Carried
At Close of Period | | | | | Property (Type) (1) | Location | Encumbrances (2) | Land | Building
and Land Improvements | Costs Capitalized Subsequent to Acquisition | Land | Building
and Land Improvements | Total
(3) | Accumulated Depreciation (4) | Year Built or Renovated | Date Acquired (5) | | 7500 Advanced Gateway (O) | Huntsville, AL | — | | — | | 18,665 | | 106 | | — | | 18,771 | | 18,771 | | (2,615) | | 2020 | 3/23/2010 | | 7600 Advanced Gateway (O) | Huntsville, AL | — | | — | | 13,752 | | 35 | | — | | 13,787 | | 13,787 | | (1,861) | | 2020 | 3/23/2010 | | 7700 Advanced Gateway (O) | Huntsville, AL | 404 | | — | | 2,546 | | — | | — | | 2,546 | | 2,546 | | — | | (7) | 3/23/2010 | | 7740 Milestone Parkway (O) | Hanover, MD | — | | 3,825 | | 34,176 | | 2,102 | | 3,825 | | 36,278 | | 40,103 | | (14,171) | | 2009 | 7/2/2007 | | 7770 Backlick Road (O) | Springfield, VA | — | | 6,387 | | 78,892 | | 4,185 | | 6,387 | | 83,077 | | 89,464 | | (26,415) | | 2012 | 3/10/2010 | | 7880 Milestone Parkway (O) | Hanover, MD | — | | 4,857 | | 27,166 | | 1,804 | | 4,857 | | 28,970 | | 33,827 | | (7,829) | | 2015 | 9/17/2013 | | 8000 Rideout Road (O) | Huntsville, AL | — | | — | | 28,157 | | 213 | | — | | 28,370 | | 28,370 | | (2,697) | | 2021 | 3/23/2010 | | 8100 Rideout Road (O) | Huntsville, AL | — | | — | | 42,601 | | 11 | | — | | 42,612 | | 42,612 | | (1,583) | | 2024 | 3/23/2010 | | 8200 Rideout Road (O) | Huntsville, AL | — | | — | | 45,903 | | 12 | | — | | 45,915 | | 45,915 | | (4,725) | | 2022 | 3/23/2010 | | 8300 Rideout Road (O) | Huntsville, AL | — | | — | | 52,633 | | 17 | | — | | 52,650 | | 52,650 | | (5,554) | | 2022 | 3/23/2010 | | 8500 Advanced Gateway (O) | Huntsville, AL | 4,549 | | — | | 28,116 | | — | | — | | 28,116 | | 28,116 | | — | | (7) | 3/23/2010 | | 8600 Advanced Gateway (O) | Huntsville, AL | — | | — | | 27,314 | | 70 | | — | | 27,384 | | 27,384 | | (3,455) | | 2020 | 3/23/2010 | | 8621 Robert Fulton Drive (O) | Columbia, MD | — | | 2,317 | | 12,642 | | 8,177 | | 2,317 | | 20,819 | | 23,136 | | (11,864) | | 2005-2006 | 6/10/2005 | | 8661 Robert Fulton Drive (O) | Columbia, MD | — | | 1,510 | | 3,764 | | 4,238 | | 1,510 | | 8,002 | | 9,512 | | (4,968) | | 2002 | 12/30/2003 | | 8671 Robert Fulton Drive (O) | Columbia, MD | — | | 1,718 | | 4,280 | | 4,848 | | 1,718 | | 9,128 | | 10,846 | | (6,547) | | 2002 | 12/30/2003 | | 870 Elkridge Landing Road (O) | Linthicum, MD | — | | 2,003 | | 9,442 | | 10,622 | | 2,003 | | 20,064 | | 22,067 | | (15,037) | | 1981 | 8/3/2001 | | 8800 Redstone Gateway (O) | Huntsville, AL | — | | — | | 18,470 | | 168 | | — | | 18,638 | | 18,638 | | (2,828) | | 2019 | 3/23/2010 | | 891 Elkridge Landing Road (O) | Linthicum, MD | — | | 1,165 | | 4,772 | | 4,471 | | 1,165 | | 9,243 | | 10,408 | | (6,886) | | 1984 | 7/2/2001 | | 901 Elkridge Landing Road (O) | Linthicum, MD | — | | 1,156 | | 4,437 | | 8,447 | | 1,156 | | 12,884 | | 14,040 | | (8,008) | | 1984 | 7/2/2001 | | 911 Elkridge Landing Road (O) | Linthicum, MD | — | | 1,215 | | 4,861 | | 4,729 | | 1,215 | | 9,590 | | 10,805 | | (6,449) | | 1985 | 4/30/1998 | | 938 Elkridge Landing Road (O) | Linthicum, MD | — | | 922 | | 4,748 | | 1,544 | | 922 | | 6,292 | | 7,214 | | (4,159) | | 1984 | 7/2/2001 | | 939 Elkridge Landing Road (O) | Linthicum, MD | — | | 939 | | 3,756 | | 11,247 | | 939 | | 15,003 | | 15,942 | | (7,599) | | 1983 | 4/30/1998 | | 9700 Advanced Gateway (O) | Huntsville, AL | — | | — | | 15,329 | | — | | — | | 15,329 | | 15,329 | | (207) | | 2025 | 3/23/2010 | | Arundel Preserve (L) | Hanover, MD | — | | 13,352 | | 10,809 | | — | | 13,352 | | 10,809 | | 24,161 | | — | | (6) | 7/2/2007 | | Canton Crossing Land (L) | Baltimore, MD | — | | — | | 6,000 | | 54 | | — | | 6,054 | | 6,054 | | (54) | | (6) | 10/27/2009 | | Canton Crossing Util Distr Ctr (O) | Baltimore, MD | — | | 2,866 | | 7,271 | | 2,399 | | 2,866 | | 9,670 | | 12,536 | | (8,294) | | 2006 | 10/27/2009 | | Columbia Gateway - Southridge (L) | Columbia, MD | — | | 6,387 | | 3,725 | | — | | 6,387 | | 3,725 | | 10,112 | | — | | (6) | 9/20/2004 | | Dahlgren Technology Center (L) | Dahlgren, VA | — | | 978 | | 178 | | — | | 978 | | 178 | | 1,156 | | — | | (6) | 3/16/2005 | | Expedition VII (O) | Lexington Park, MD | — | | 705 | | 8,677 | | 3 | | 705 | | 8,680 | | 9,385 | | (773) | | 2022 | 3/24/2004 | | M Square Research Park (L) | College Park, MD | — | | — | | 2,043 | | — | | — | | 2,043 | | 2,043 | | — | | (6) | 1/29/2008 | | MP 3 (O) | Northern Virginia | 11,364 | | 9,038 | | 51,798 | | — | | 9,038 | | 51,798 | | 60,836 | | (97) | | 2025 | 11/8/2018 | | National Business Park North (L) | Annapolis Junction, MD | — | | 15,554 | | 31,981 | | 2 | | 15,554 | | 31,983 | | 47,537 | | — | | (6) | 6/29/2006 | | North Gate Business Park (L) | Aberdeen, MD | — | | 1,755 | | 264 | | — | | 1,755 | | 264 | | 2,019 | | — | | (6) | 9/14/2007 | | NoVA Office A (O) | Chantilly, VA | — | | 2,096 | | 46,849 | | 5 | | 2,096 | | 46,854 | | 48,950 | | (12,777) | | 2015 | 7/18/2002 | | NoVA Office B (O) | Chantilly, VA | — | | 739 | | 38,376 | | — | | 739 | | 38,376 | | 39,115 | | (8,636) | | 2016 | 7/18/2002 | | NoVA Office C (O) | Chantilly, VA | — | | 7,751 | | 85,820 | | — | | 7,751 | | 85,820 | | 93,571 | | (8,805) | | 2021 | 7/18/2002 | | NoVA Office D (O) | Chantilly, VA | — | | 6,587 | | 40,559 | | 7 | | 6,587 | | 40,566 | | 47,153 | | (8,533) | | 2017 | 7/2/2013 |
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Initial Cost | | Gross Amounts Carried
At Close of Period | | | | | Property (Type) (1) | Location | Encumbrances (2) | Land | Building
and Land Improvements | Costs Capitalized Subsequent to Acquisition | Land | Building
and Land Improvements | Total
(3) | Accumulated Depreciation (4) | Year Built or Renovated | Date Acquired (5) | | Oak Grove A (O) | Northern Virginia | — | | 12,866 | | 42,090 | | — | | 12,866 | | 42,090 | | 54,956 | | (5,386) | | 2020 | 11/1/2018 | | Oak Grove B (O) | Northern Virginia | — | | 12,866 | | 41,621 | | — | | 12,866 | | 41,621 | | 54,487 | | (5,995) | | 2019 | 11/1/2018 | | Oak Grove C (O) | Northern Virginia | — | | 11,741 | | 79,188 | | — | | 11,741 | | 79,188 | | 90,929 | | (7,280) | | 2022 | 11/1/2018 | | Oak Grove D (O) | Northern Virginia | — | | 11,741 | | 78,905 | | — | | 11,741 | | 78,905 | | 90,646 | | (6,011) | | 2022 | 11/1/2018 | | Old Annapolis Road (O) | Columbia, MD | — | | 1,637 | | 5,500 | | 7,044 | | 1,637 | | 12,544 | | 14,181 | | (7,479) | | 1974/1985 | 12/14/2000 | | Patriot Ridge (L) | Springfield, VA | — | | 18,517 | | 14,656 | | — | | 18,517 | | 14,656 | | 33,173 | | — | | (6) | 3/10/2010 | | Project EL (O) | Confidential-USA | — | | 7,190 | | 46,922 | | — | | 7,190 | | 46,922 | | 54,112 | | (5,232) | | 2021 | 1/20/2006 | | Project EL 2 (O) | Confidential-USA | — | | — | | 813 | | — | | — | | 813 | | 813 | | — | | (7) | 1/20/2006 | | Project EX (O) | Confidential-USA | — | | 13,010 | | 19,107 | | — | | 13,010 | | 19,107 | | 32,117 | | (3,282) | | 2018 | 7/16/2008 | | PS A (O) | Northern Virginia | — | | 4,078 | | 54,776 | | — | | 4,078 | | 54,776 | | 58,854 | | (3,247) | | 2023 | 1/27/2005 | | PS B (O) | Northern Virginia | — | | 3,468 | | 47,738 | | — | | 3,468 | | 47,738 | | 51,206 | | (2,431) | | 2023 | 1/27/2005 | | Redstone Gateway (L) | Huntsville, AL | 305 | | — | | 31,955 | | 66 | | — | | 32,021 | | 32,021 | | (9) | | (6) | 3/23/2010 | | Sentry Gateway - T (O) | San Antonio, TX | — | | 14,020 | | 38,804 | | 62 | | 14,020 | | 38,866 | | 52,886 | | (18,324) | | 1982/2008 | 3/30/2005 | | Sentry Gateway - V (O) | San Antonio, TX | — | | — | | 1,066 | | — | | — | | 1,066 | | 1,066 | | (454) | | 2007 | 3/30/2005 | | Sentry Gateway - W (O) | San Antonio, TX | — | | — | | 1,884 | | 71 | | — | | 1,955 | | 1,955 | | (807) | | 2009 | 3/30/2005 | | Sentry Gateway - X (O) | San Antonio, TX | — | | 1,964 | | 21,178 | | 53 | | 1,964 | | 21,231 | | 23,195 | | (8,075) | | 2010 | 1/20/2006 | | Sentry Gateway - Y (O) | San Antonio, TX | — | | 1,964 | | 21,298 | | 275 | | 1,964 | | 21,573 | | 23,537 | | (8,165) | | 2010 | 1/20/2006 | | Sentry Gateway - Z (O) | San Antonio, TX | — | | 1,964 | | 30,573 | | — | | 1,964 | | 30,573 | | 32,537 | | (8,262) | | 2015 | 6/14/2005 | | Southpoint Phase 2 Bldg A (O) | Northern Virginia | — | | 4,404 | | 67,277 | | — | | 4,404 | | 67,277 | | 71,681 | | (1,743) | | 2024 | 7/24/2019 | | Southpoint Phase 2 Bldg B (O) | Northern Virginia | — | | 3,752 | | 38,587 | | — | | 3,752 | | 38,587 | | 42,339 | | (132) | | 2025 | 7/24/2019 | | Westfields - Park Center (L) | Chantilly, VA | — | | 8,667 | | 4,156 | | — | | 8,667 | | 4,156 | | 12,823 | | — | | (6) | 7/2/2013 | Other Developments, including
intercompany eliminations (V) | Various | — | | — | | 1,140 | | 270 | | — | | 1,410 | | 1,410 | | (256) | | Various | Various | | | $ | 142,239 | | $ | 620,983 | | $ | 3,954,910 | | $ | 889,951 | | $ | 620,983 | | $ | 4,844,861 | | $ | 5,465,844 | | $ | (1,682,367) | | | |
(1)A legend for the Property Type follows: (O) = Office or data center shell property; (L) = Land held or pre-development; and (V) = Various. (2)Excludes our Revolving Credit Facility of $54.0 million, term loan facilities of $49.9 million, unsecured senior notes of $2.5 billion, unsecured notes payable of $61,000, and deferred financing costs, net of premiums, on the remaining loans of $50,000. (3)The aggregate gross amounts carried for federal income tax purposes as of December 31, 2025 was approximately $5.7 billion, or $4.1 billion net of accumulated depreciation. (4)The estimated lives over which depreciation is recognized follow: Building and land improvements: 10-40 years; and tenant improvements: related lease terms. (5)The acquisition date of multi-parcel properties reflects the date of the earliest parcel acquisition. The acquisition date of properties owned through real estate joint ventures reflects the date of the formation of the joint venture. (6)Held as of December 31, 2025. (7)Under development as of December 31, 2025. The following table summarizes our changes in cost of properties for the years ended December 31, 2025, 2024 and 2023 (in thousands): | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 2025 | | 2024 | | 2023 | | Beginning balance | | | $ | 5,167,819 | | | $ | 4,903,840 | | | $ | 4,986,537 | | | Acquisitions of operating properties (1) | | | 20,300 | | | 24,996 | | | — | | | Improvements and other additions | | | 279,673 | | | 239,096 | | | 333,081 | | | Sales (2) | | | (1,764) | | | — | | | (162,981) | | | Impairments (3) | | | — | | | — | | | (252,797) | | | | | | | | | | | | | | Other dispositions | | | (184) | | | (113) | | | — | | | | | | | | | | | | Ending balance | | | $ | 5,465,844 | | | $ | 5,167,819 | | | $ | 4,903,840 | | | | | | | | | | | | | | The following table summarizes our changes in accumulated depreciation for the same time periods (in thousands): | | | | | | | 2025 | | 2024 | | 2023 | | Beginning balance | | | $ | 1,537,293 | | | $ | 1,400,162 | | | $ | 1,273,448 | | | Depreciation expense | | | 145,074 | | | 137,224 | | | 132,728 | | | Sales (2) | | | — | | | — | | | (6,014) | | | | | | | | | | | | | | | | | | | | | | | Other dispositions | | | — | | | (93) | | | — | | | Ending balance | | | $ | 1,682,367 | | | $ | 1,537,293 | | | $ | 1,400,162 | | | | | | | | | | | | |
(1)Includes acquisitions of operating properties in 2025 and 2024, as described in Note 4 to our consolidated financial statements. These amounts exclude intangible assets associated with the acquisitions. (2)Includes sale of a parcel of land in 2025 and sale of our ownership interest in data center shells through a newly-formed unconsolidated real estate joint venture in 2023 as described in Note 4 to our consolidated financial statements. (3)Includes impairment recognized on six operating properties and a parcel of land, as described in Note 4 to our consolidated financial statements.
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