Schedule III - Real Estate and Accumulated Depreciation

v3.25.4

Schedule III - Real Estate and Accumulated Depreciation	12 Months Ended
	Dec. 31, 2025
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation Disclosure [Abstract]
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.