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Schedule III - Real Estate and Accumulated Depreciation

12 Months Ended

Dec. 31, 2022

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	$	—	$	26,715	$	58,002	$	45,315	$	26,715	$	103,317	$	130,032	$	(30,601)	1973/2011	8/7/2015
100 Secured Gateway (O)	Huntsville, AL	—		—		71,159		34		—		71,193		71,193		(4,121)		2020	3/23/2010
1000 Redstone Gateway (O)	Huntsville, AL	8,880		—		20,533		108		—		20,641		20,641		(5,045)		2013	3/23/2010
1100 Redstone Gateway (O)	Huntsville, AL	9,547		—		19,593		100		—		19,693		19,693		(4,408)		2014	3/23/2010
114 National Business Parkway (O)	Annapolis Junction, MD	—		364		3,109		427		364		3,536		3,900		(1,779)		2002	6/30/2000
1200 Redstone Gateway (O)	Huntsville, AL	11,012		—		22,389		121		—		22,510		22,510		(5,077)		2013	3/23/2010
1201 M Street SE (O)	Washington, DC	—		—		49,775		10,384		—		60,159		60,159		(23,155)		2001	9/28/2010
1201 Winterson Road (O)	Linthicum, MD	—		2,130		17,202		924		2,130		18,126		20,256		(6,403)		1985/2017	4/30/1998
1220 12th Street SE (O)	Washington, DC	—		—		42,464		9,919		—		52,383		52,383		(21,522)		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		6,392		1,906		14,015		15,921		(8,472)		1990	9/28/1998
132 National Business Parkway (O)	Annapolis Junction, MD	—		2,917		12,259		4,984		2,917		17,243		20,160		(11,464)		2000	5/28/1999
133 National Business Parkway (O)	Annapolis Junction, MD	—		2,517		10,068		6,733		2,517		16,801		19,318		(11,461)		1997	9/28/1998
134 National Business Parkway (O)	Annapolis Junction, MD	—		3,684		7,517		5,958		3,684		13,475		17,159		(8,950)		1999	11/13/1998
1340 Ashton Road (O)	Hanover, MD	—		905		3,620		2,631		905		6,251		7,156		(3,639)		1989	4/28/1999
13450 Sunrise Valley Drive (O)	Herndon, VA	—		1,386		5,576		4,955		1,386		10,531		11,917		(7,040)		1998	7/25/2003
13454 Sunrise Valley Drive (O)	Herndon, VA	—		2,847		11,986		10,345		2,847		22,331		25,178		(13,637)		1998	7/25/2003
135 National Business Parkway (O)	Annapolis Junction, MD	—		2,484		9,750		7,085		2,484		16,835		19,319		(11,512)		1998	12/30/1998
1362 Mellon Road (O)	Hanover, MD	—		950		3,864		1,953		950		5,817		6,767		(1,577)		2006	2/10/2006
13857 McLearen Road (O)	Herndon, VA	—		3,507		30,177		5,715		3,507		35,892		39,399		(14,907)		2007	7/11/2012
140 National Business Parkway (O)	Annapolis Junction, MD	—		3,407		24,167		1,811		3,407		25,978		29,385		(12,361)		2003	12/31/2003
141 National Business Parkway (O)	Annapolis Junction, MD	—		2,398		9,538		4,832		2,398		14,370		16,768		(10,153)		1990	9/28/1998
14280 Park Meadow Drive (O)	Chantilly, VA	—		3,731		15,953		5,621		3,731		21,574		25,305		(11,413)		1999	9/29/2004
1460 Dorsey Road (L)	Hanover, MD	—		1,577		183		—		1,577		183		1,760		—		(6)	2/28/2006
14840 Conference Center Drive (O)	Chantilly, VA	—		1,572		8,175		5,728		1,572		13,903		15,475		(8,420)		2000	7/25/2003
14850 Conference Center Drive (O)	Chantilly, VA	—		1,615		8,358		7,439		1,615		15,797		17,412		(8,032)		2000	7/25/2003
14900 Conference Center Drive (O)	Chantilly, VA	—		3,436		14,402		9,371		3,436		23,773		27,209		(14,901)		1999	7/25/2003
1501 South Clinton Street (O)	Baltimore, MD	—		27,964		51,990		44,816		27,964		96,806		124,770		(34,787)		2006	10/27/2009
15049 Conference Center Drive (O)	Chantilly, VA	—		4,415		20,365		17,846		4,415		38,211		42,626		(22,574)		1997	8/14/2002
15059 Conference Center Drive (O)	Chantilly, VA	—		5,753		13,615		6,313		5,753		19,928		25,681		(11,364)		2000	8/14/2002
1550 West Nursery Road (O)	Linthicum, MD	—		14,071		16,930		—		14,071		16,930		31,001		(7,047)		2009	10/28/2009
1560 West Nursery Road (O)	Linthicum, MD	—		1,441		113		—		1,441		113		1,554		(24)		2014	10/28/2009
1610 West Nursery Road (O)	Linthicum, MD	—		259		246		—		259		246		505		(36)		2016	4/30/1998
1616 West Nursery Road (O)	Linthicum, MD	—		393		3,323		75		393		3,398		3,791		(449)		2017	4/30/1998
1622 West Nursery Road (O)	Linthicum, MD	—		393		2,542		—		393		2,542		2,935		(372)		2016	4/30/1998
16442 Commerce Drive (O)	Dahlgren, VA	—		613		2,582		1,147		613		3,729		4,342		(2,134)		2002	12/21/2004
16480 Commerce Drive (O)	Dahlgren, VA	—		1,856		7,425		2,772		1,856		10,197		12,053		(5,203)		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	1,040	522	3,130	3,652	(1,689)	2002	12/21/2004
16539 Commerce Drive (O)	Dahlgren, VA	—	688	2,860	2,345	688	5,205	5,893	(3,190)	1990	12/21/2004
16541 Commerce Drive (O)	Dahlgren, VA	—	773	3,094	2,630	773	5,724	6,497	(3,261)	1996	12/21/2004
16543 Commerce Drive (O)	Dahlgren, VA	—	436	1,742	879	436	2,621	3,057	(1,467)	2002	12/21/2004
1751 Pinnacle Drive (O)	McLean, VA	—	10,486	42,339	34,512	10,486	76,851	87,337	(45,785)	1989/1995	9/23/2004
1753 Pinnacle Drive (O)	McLean, VA	—	8,275	34,353	25,142	8,275	59,495	67,770	(30,720)	1976/2004	9/23/2004
206 Research Boulevard (O)	Aberdeen, MD	—	—	—	—	—	—	—	—	2012	9/14/2007
209 Research Boulevard (O)	Aberdeen, MD	—	134	1,711	543	134	2,254	2,388	(772)	2010	9/14/2007
210 Research Boulevard (O)	Aberdeen, MD	—	113	1,402	536	113	1,938	2,051	(610)	2010	9/14/2007
2100 L Street (O)	Washington, DC	—	57,385	94,784	—	57,385	94,784	152,169	(4,385)	2020	8/11/2015
2100 Rideout Road (O)	Huntsville, AL	—	—	7,336	3,015	—	10,351	10,351	(2,760)	2016	3/23/2010
22289 Exploration Drive (O)	Lexington Park, MD	—	1,422	5,719	2,148	1,422	7,867	9,289	(4,585)	2000	3/24/2004
22299 Exploration Drive (O)	Lexington Park, MD	—	1,362	5,791	3,084	1,362	8,875	10,237	(5,531)	1998	3/24/2004
22300 Exploration Drive (O)	Lexington Park, MD	—	1,094	5,038	2,772	1,094	7,810	8,904	(4,640)	1997	11/9/2004
22309 Exploration Drive (O)	Lexington Park, MD	—	2,243	10,419	8,179	2,243	18,598	20,841	(9,668)	1984/1997	3/24/2004
23535 Cottonwood Parkway (O)	California, MD	—	692	3,051	648	692	3,699	4,391	(2,358)	1984	3/24/2004
250 W Pratt St (O)	Baltimore, MD	—	8,057	34,588	19,811	8,057	54,399	62,456	(22,224)	1985	3/19/2015
2600 Park Tower Drive (O)	Vienna, VA	—	20,284	34,443	5,977	20,284	40,420	60,704	(9,764)	1999	4/15/2015
2691 Technology Drive (O)	Annapolis Junction, MD	—	2,098	17,334	9,191	2,098	26,525	28,623	(13,031)	2005	5/26/2000
2701 Technology Drive (O)	Annapolis Junction, MD	—	1,737	15,266	7,118	1,737	22,384	24,121	(14,080)	2001	5/26/2000
2711 Technology Drive (O)	Annapolis Junction, MD	—	2,251	21,611	4,459	2,251	26,070	28,321	(16,361)	2002	11/13/2000
2720 Technology Drive (O)	Annapolis Junction, MD	—	3,863	29,272	3,219	3,863	32,491	36,354	(15,238)	2004	1/31/2002
2721 Technology Drive (O)	Annapolis Junction, MD	—	4,611	14,597	3,828	4,611	18,425	23,036	(11,406)	2000	10/21/1999
2730 Hercules Road (O)	Annapolis Junction, MD	—	8,737	31,612	9,540	8,737	41,152	49,889	(25,143)	1990	9/28/1998
30 Light Street (O)	Baltimore, MD	—	—	12,101	1,056	—	13,157	13,157	(2,742)	2009	8/7/2015
300 Secured Gateway (O)	Annapolis Junction, MD	—	—	25,384	—	—	25,384	25,384	—	(7)	3/23/2010
300 Sentinel Drive (O)	Annapolis Junction, MD	—	1,517	59,165	2,526	1,517	61,691	63,208	(20,225)	2009	11/14/2003
302 Sentinel Drive (O)	Annapolis Junction, MD	—	2,648	29,687	3,802	2,648	33,489	36,137	(12,102)	2007	11/14/2003
304 Sentinel Drive (O)	Annapolis Junction, MD	—	3,411	24,917	5,335	3,411	30,252	33,663	(13,355)	2005	11/14/2003
306 Sentinel Drive (O)	Annapolis Junction, MD	—	3,260	22,592	3,720	3,260	26,312	29,572	(11,085)	2006	11/14/2003
308 Sentinel Drive (O)	Annapolis Junction, MD	—	1,422	26,208	2,365	1,422	28,573	29,995	(8,761)	2010	11/14/2003
310 Sentinel Way (O)	Annapolis Junction, MD	—	2,372	43,312	—	2,372	43,312	45,684	(7,180)	2016	11/14/2003
310 The Bridge Street (O)	Huntsville, AL	—	261	26,530	5,958	261	32,488	32,749	(13,337)	2009	8/9/2011
312 Sentinel Way (O)	Annapolis Junction, MD	—	3,138	27,797	—	3,138	27,797	30,935	(5,779)	2014	11/14/2003
314 Sentinel Way (O)	Annapolis Junction, MD	—	1,254	7,741	—	1,254	7,741	8,995	(1,713)	2008	11/14/2003
316 Sentinel Way (O)	Annapolis Junction, MD	—	2,748	38,156	225	2,748	38,381	41,129	(10,394)	2011	11/14/2003
318 Sentinel Way (O)	Annapolis Junction, MD	—	2,185	28,426	562	2,185	28,988	31,173	(12,249)	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	(8,206)	2007	11/14/2003
322 Sentinel Way (O)	Annapolis Junction, MD	—	2,605	22,827	1,900	2,605	24,727	27,332	(10,090)	2006	11/14/2003
324 Sentinel Way (O)	Annapolis Junction, MD	—	1,656	23,018	42	1,656	23,060	24,716	(7,109)	2010	6/29/2006
4000 Market Street (O)	Huntsville, AL	5,993	—	9,198	396	—	9,594	9,594	(858)	2018	3/23/2010
410 National Business Parkway (O)	Annapolis Junction, MD	—	1,831	23,257	2,259	1,831	25,516	27,347	(7,048)	2012	6/29/2006
4100 Market Street (O)	Huntsville, AL	5,217	—	8,049	7	—	8,056	8,056	(710)	2019	3/23/2010
420 National Business Parkway (O)	Annapolis Junction, MD	—	2,370	29,550	208	2,370	29,758	32,128	(6,217)	2013	6/29/2006
430 National Business Parkway (O)	Annapolis Junction, MD	—	1,852	21,563	2,950	1,852	24,513	26,365	(6,632)	2011	6/29/2006
44408 Pecan Court (O)	California, MD	—	817	1,583	1,751	817	3,334	4,151	(2,259)	1986	3/24/2004
44414 Pecan Court (O)	California, MD	—	405	1,619	1,149	405	2,768	3,173	(1,861)	1986	3/24/2004
44417 Pecan Court (O)	California, MD	—	434	3,822	180	434	4,002	4,436	(2,385)	1989/2015	3/24/2004
44420 Pecan Court (O)	California, MD	—	344	890	311	344	1,201	1,545	(667)	1989	11/9/2004
44425 Pecan Court (O)	California, MD	—	1,309	3,506	2,395	1,309	5,901	7,210	(4,076)	1997	5/5/2004
45310 Abell House Lane (O)	California, MD	—	2,272	13,808	1,386	2,272	15,194	17,466	(4,357)	2011	8/30/2010
4600 River Road (O)	College Park, MD	—	—	24,573	—	—	24,573	24,573	(1,049)	2020	1/29/2008
46579 Expedition Drive (O)	Lexington Park, MD	—	1,406	5,796	2,987	1,406	8,783	10,189	(4,897)	2002	3/24/2004
46591 Expedition Drive (O)	Lexington Park, MD	—	1,200	7,199	4,394	1,200	11,593	12,793	(5,181)	2005	3/24/2004
4851 Stonecroft Boulevard (O)	Chantilly, VA	—	1,878	11,558	223	1,878	11,781	13,659	(5,307)	2004	8/14/2002
540 National Business Parkway (O)	Annapolis Junction, MD	—	2,035	31,840	41	2,035	31,881	33,916	(4,124)	2017	6/29/2006
550 National Business Parkway (O)	Annapolis Junction, MD	—	2,678	30,363	—	2,678	30,363	33,041	—	(7)	6/29/2006
5520 Research Park Drive (O)	Catonsville, MD	—	—	20,072	1,979	—	22,051	22,051	(7,741)	2009	4/4/2006
5522 Research Park Drive (O)	Catonsville, MD	—	—	4,550	855	—	5,405	5,405	(2,050)	2007	3/8/2006
560 National Business Parkway (O)	Annapolis Junction, MD	—	2,193	55,149	—	2,193	55,149	57,342	(233)	2022	6/29/2006
5801 University Research Court (O)	College Park, MD	10,880	—	17,431	162	—	17,593	17,593	(2,294)	2018	1/29/2008
5825 University Research Court (O)	College Park, MD	19,075	—	22,771	2,517	—	25,288	25,288	(8,978)	2008	1/29/2008
5850 University Research Court (O)	College Park, MD	20,182	—	31,906	1,112	—	33,018	33,018	(10,623)	2008	1/29/2008
6000 Redstone Gateway (O)	Huntsville, AL	—	—	8,532	17	—	8,549	8,549	(415)	2020	3/23/2010
610 Guardian Way (O)	Annapolis Junction, MD	—	7,636	53,574	—	7,636	53,574	61,210	(1,572)	2021	6/29/2006
6200 Redstone Gateway (O)	Huntsville, AL	—	—	38,479	—	—	38,479	38,479	—	2022	3/23/2010
6700 Alexander Bell Drive (O)	Columbia, MD	—	1,755	7,019	10,504	1,755	17,523	19,278	(10,285)	1988	5/14/2001
6708 Alexander Bell Drive (O)	Columbia, MD	—	897	12,693	1,618	897	14,311	15,208	(5,238)	1988/2016	5/14/2001
6711 Columbia Gateway Drive (O)	Columbia, MD	—	2,683	23,239	2,885	2,683	26,124	28,807	(10,779)	2006-2007	9/28/2000
6716 Alexander Bell Drive (O)	Columbia, MD	—	1,242	4,969	5,323	1,242	10,292	11,534	(6,718)	1990	12/31/1998
6721 Columbia Gateway Drive (O)	Columbia, MD	—	1,753	34,090	9,263	1,753	43,353	45,106	(13,231)	2009	9/28/2000
6724 Alexander Bell Drive (O)	Columbia, MD	—	449	5,039	2,491	449	7,530	7,979	(4,349)	2001	5/14/2001
6731 Columbia Gateway Drive (O)	Columbia, MD	—	2,807	19,098	6,351	2,807	25,449	28,256	(14,983)	2002	3/29/2000
6740 Alexander Bell Drive (O)	Columbia, MD	—	1,424	4,209	7,131	1,424	11,340	12,764	(2,773)	1992	12/31/1998


			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)
6741 Columbia Gateway Drive (O)	Columbia, MD	—	675	1,711	176	675	1,887	2,562	(762)	2008	9/28/2000
6750 Alexander Bell Drive (O)	Columbia, MD	—	1,263	12,461	6,050	1,263	18,511	19,774	(11,751)	2001	12/31/1998
6760 Alexander Bell Drive (O)	Columbia, MD	—	890	3,561	3,915	890	7,476	8,366	(5,348)	1991	12/31/1998
6940 Columbia Gateway Drive (O)	Columbia, MD	—	3,545	9,916	12,340	3,545	22,256	25,801	(12,733)	1999	11/13/1998
6950 Columbia Gateway Drive (O)	Columbia, MD	—	3,596	28,307	3,223	3,596	31,530	35,126	(13,441)	1998/2019	10/22/1998
7000 Columbia Gateway Drive (O)	Columbia, MD	—	3,131	12,103	10,451	3,131	22,554	25,685	(11,944)	1999	5/31/2002
7000 Redstone Gateway (O)	Huntsville, AL	—	—	7,542	—	—	7,542	7,542	—	2022 (7)	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	3,560	2,058	9,653	11,711	(5,447)	1999	12/1/2005
7061 Columbia Gateway Drive (O)	Columbia, MD	—	729	3,094	2,909	729	6,003	6,732	(3,806)	2000	8/30/2001
7063 Columbia Gateway Drive (O)	Columbia, MD	—	902	3,684	3,470	902	7,154	8,056	(4,975)	2000	8/30/2001
7065 Columbia Gateway Drive (O)	Columbia, MD	—	919	3,763	3,174	919	6,937	7,856	(4,846)	2000	8/30/2001
7067 Columbia Gateway Drive (O)	Columbia, MD	—	1,829	11,823	8,125	1,829	19,948	21,777	(10,234)	2001	8/30/2001
7100 Redstone Gateway (O)	Huntsville, AL	—	—	12,983	—	—	12,983	12,983	(514)	2021	3/23/2010
7125 Columbia Gateway Drive (O)	Columbia, MD	—	20,487	49,925	27,278	20,487	77,203	97,690	(32,510)	1973/1999	6/29/2006
7130 Columbia Gateway Drive (O)	Columbia, MD	—	1,350	4,359	3,029	1,350	7,388	8,738	(4,363)	1989	9/19/2005
7134 Columbia Gateway Drive (O)	Columbia, MD	—	704	4,700	817	704	5,517	6,221	(2,144)	1990/2016	9/19/2005
7138 Columbia Gateway Drive (O)	Columbia, MD	—	1,104	3,518	2,963	1,104	6,481	7,585	(4,506)	1990	9/19/2005
7142 Columbia Gateway Drive (O)	Columbia, MD	—	1,342	7,148	2,851	1,342	9,999	11,341	(4,803)	1994/2018	9/19/2005
7150 Columbia Gateway Drive (O)	Columbia, MD	—	1,032	3,429	1,659	1,032	5,088	6,120	(2,165)	1991	9/19/2005
7150 Riverwood Drive (O)	Columbia, MD	—	1,821	4,388	3,436	1,821	7,824	9,645	(3,316)	2000	1/10/2007
7160 Riverwood Drive (O)	Columbia, MD	—	2,732	7,006	4,609	2,732	11,615	14,347	(5,835)	2000	1/10/2007
7170 Riverwood Drive (O)	Columbia, MD	—	1,283	3,096	2,387	1,283	5,483	6,766	(3,002)	2000	1/10/2007
7175 Riverwood Drive (O)	Columbia, MD	—	1,788	7,269	—	1,788	7,269	9,057	(1,661)	1996/2013	7/27/2005
7200 Redstone Gateway (O)	Huntsville, AL	—	—	8,348	81	—	8,429	8,429	(1,830)	2013	3/23/2010
7200 Riverwood Drive (O)	Columbia, MD	—	4,089	22,630	5,036	4,089	27,666	31,755	(14,245)	1986	10/13/1998
7205 Riverwood Drive (O)	Columbia, MD	—	1,367	21,419	—	1,367	21,419	22,786	(5,058)	2013	7/27/2005
7272 Park Circle Drive (O)	Hanover, MD	—	1,479	6,300	4,609	1,479	10,909	12,388	(6,471)	1991/1996	1/10/2007
7318 Parkway Drive (O)	Hanover, MD	—	972	3,888	2,284	972	6,172	7,144	(3,374)	1984	4/16/1999
7400 Redstone Gateway (O)	Huntsville, AL	—	—	9,223	75	—	9,298	9,298	(1,756)	2015	3/23/2010
7467 Ridge Road (O)	Hanover, MD	—	1,565	3,116	6,876	1,565	9,992	11,557	(5,137)	1990	4/28/1999
7500 Advanced Gateway (O)	Huntsville, AL	—	—	18,665	—	—	18,665	18,665	(1,201)	2020	3/23/2010
7600 Advanced Gateway (O)	Huntsville, AL	—	—	13,752	—	—	13,752	13,752	(826)	2020	3/23/2010
7740 Milestone Parkway (O)	Hanover, MD	15,942	3,825	34,176	1,262	3,825	35,438	39,263	(11,179)	2009	7/2/2007
7770 Backlick Road (O)	Springfield, VA	—	6,387	78,892	1,669	6,387	80,561	86,948	(19,584)	2012	3/10/2010
7880 Milestone Parkway (O)	Hanover, MD	—	4,857	27,175	1,617	4,857	28,792	33,649	(5,068)	2015	9/17/2013
8000 Rideout Road (O)	Huntsville, AL	—	—	27,579	—	—	27,579	27,579	(529)	2021	3/23/2010


			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)
8100 Rideout Road (O)	Huntsville, AL	—	—	14,606	—	—	14,606	14,606	—	(7)	3/23/2010
8200 Rideout Road (O)	Huntsville, AL	—	—	43,115	—	—	43,115	43,115	—	2022	3/23/2010
8300 Rideout Road (O)	Huntsville, AL	—	—	47,658	—	—	47,658	47,658	—	2022	3/23/2010
8600 Advanced Gateway (O)	Huntsville, AL	—	—	27,312	—	—	27,312	27,312	(1,394)	2020	3/23/2010
8621 Robert Fulton Drive (O)	Columbia, MD	—	2,317	12,642	7,680	2,317	20,322	22,639	(9,467)	2005-2006	6/10/2005
8661 Robert Fulton Drive (O)	Columbia, MD	—	1,510	3,764	3,313	1,510	7,077	8,587	(4,129)	2002	12/30/2003
8671 Robert Fulton Drive (O)	Columbia, MD	—	1,718	4,280	4,848	1,718	9,128	10,846	(5,418)	2002	12/30/2003
870 Elkridge Landing Road (O)	Linthicum, MD	—	2,003	9,442	10,464	2,003	19,906	21,909	(13,432)	1981	8/3/2001
8800 Redstone Gateway (O)	Huntsville, AL	11,565	—	18,470	—	—	18,470	18,470	(1,437)	2019	3/23/2010
891 Elkridge Landing Road (O)	Linthicum, MD	—	1,165	4,772	3,994	1,165	8,766	9,931	(5,750)	1984	7/2/2001
901 Elkridge Landing Road (O)	Linthicum, MD	—	1,156	4,437	7,069	1,156	11,506	12,662	(5,724)	1984	7/2/2001
911 Elkridge Landing Road (O)	Linthicum, MD	—	1,215	4,861	3,347	1,215	8,208	9,423	(5,448)	1985	4/30/1998
938 Elkridge Landing Road (O)	Linthicum, MD	—	922	4,748	1,516	922	6,264	7,186	(3,619)	1984	7/2/2001
939 Elkridge Landing Road (O)	Linthicum, MD	—	939	3,756	4,687	939	8,443	9,382	(6,313)	1983	4/30/1998
Arundel Preserve (L)	Hanover, MD	—	13,352	9,844	—	13,352	9,844	23,196	—	(6)	7/2/2007
Canton Crossing Land (L)	Baltimore, MD	—	17,285	8,438	1,076	17,285	9,514	26,799	(17)	(6)	10/27/2009
Canton Crossing Util Distr Ctr (O)	Baltimore, MD	—	6,100	10,450	1,974	6,100	12,424	18,524	(7,510)	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	8,332	—	705	8,332	9,037	(113)	2022 (7)	3/24/2004
M Square Research Park (L)	College Park, MD	—	—	3,230	—	—	3,230	3,230	—	(6)	1/29/2008
MR Land (L)	Northern Virginia	—	9,038	809	—	9,038	809	9,847	—	(6)	11/8/2018
National Business Park North (L)	Annapolis Junction, MD	—	15,554	21,463	—	15,554	21,463	37,017	—	(6)	6/29/2006
North Gate Business Park (L)	Aberdeen, MD	—	1,755	5	—	1,755	5	1,760	—	(6)	9/14/2007
NoVA Office A (O)	Chantilly, VA	—	2,096	46,849	—	2,096	46,849	48,945	(9,266)	2015	7/18/2002
NoVA Office B (O)	Chantilly, VA	—	739	38,376	—	739	38,376	39,115	(5,695)	2016	7/18/2002
NoVA Office C (O)	Chantilly, VA	—	7,751	80,771	—	7,751	80,771	88,522	(2,472)	2021	7/18/2002
NoVA Office D (O)	Chantilly, VA	—	6,587	40,559	—	6,587	40,559	47,146	(5,483)	2017	7/2/2013
Oak Grove A (O)	Northern Virginia	—	12,866	41,488	—	12,866	41,488	54,354	(2,232)	2020	11/1/2018
Oak Grove B (O)	Northern Virginia	—	12,866	41,443	—	12,866	41,443	54,309	(2,866)	2019	11/1/2018
Oak Grove C (O)	Northern Virginia	—	11,741	77,526	—	11,741	77,526	89,267	(1,369)	2022	11/1/2018
Oak Grove D (O)	Northern Virginia	—	11,741	71,279	—	11,741	71,279	83,020	(260)	2022	11/1/2018
Old Annapolis Road (O)	Columbia, MD	—	1,637	5,500	6,902	1,637	12,402	14,039	(5,882)	1974/1985	12/14/2000
P2 A (O) (8)	Northern Virginia	—	16,853	40,159	—	16,853	40,159	57,012	(2,576)	2020	5/2/2019
P2 B (O) (8)	Northern Virginia	—	22,839	36,388	—	22,839	36,388	59,227	(1,953)	2020	5/2/2019
P2 C (O) (8)	Northern Virginia	—	14,869	31,597	—	14,869	31,597	46,466	(1,485)	2020	5/2/2019
Patriot Ridge (L)	Springfield, VA	—	18,517	14,599	—	18,517	14,599	33,116	—	(6)	3/10/2010


				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)
Project EL (O)	Confidential-USA	—		7,190		46,746		—		7,190		46,746		53,936		(1,705)		2021	1/20/2006
Project EX (O)	Confidential-USA	—		13,010		19,107		—		13,010		19,107		32,117		(1,697)		2018	7/16/2008
PS A (O)	Northern Virginia	—		4,078		8,808		—		4,078		8,808		12,886		—		(7)	1/27/2005
PS B (O)	Northern Virginia	—		3,468		4,407		—		3,468		4,407		7,875		—		(7)	1/27/2005
Redstone Gateway (L)	Huntsville, AL	—		—		25,386		—		—		25,386		25,386		—		(6)	3/23/2010
Sentry Gateway - T (O)	San Antonio, TX	—		14,020		38,804		13		14,020		38,817		52,837		(15,413)		1982/2008	3/30/2005
Sentry Gateway - V (O)	San Antonio, TX	—		—		1,066		—		—		1,066		1,066		(374)		2007	3/30/2005
Sentry Gateway - W (O)	San Antonio, TX	—		—		1,884		71		—		1,955		1,955		(651)		2009	3/30/2005
Sentry Gateway - X (O)	San Antonio, TX	—		1,964		21,178		—		1,964		21,178		23,142		(6,434)		2010	1/20/2006
Sentry Gateway - Y (O)	San Antonio, TX	—		1,964		21,298		—		1,964		21,298		23,262		(6,472)		2010	1/20/2006
Sentry Gateway - Z (O)	San Antonio, TX	—		1,964		30,573		—		1,964		30,573		32,537		(5,968)		2015	6/14/2005
SP Manassas (L)	Manassas, VA	—		8,156		921		—		8,156		921		9,077		—		(6)	7/24/2019
Westfields - Park Center (L)	Chantilly, VA	—		8,667		3,170		—		8,667		3,170		11,837		—		(6)	7/2/2013

Other Developments, including intercompany eliminations (V)	Various	—		—		1,169		258		—		1,427		1,427		(135)		Various	Various
		$	118,293	$	709,752	$	3,606,680	$	670,105	$	709,752	$	4,276,785	$	4,986,537	$	(1,273,448)

(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 $211.0 million, term loan facilities of $123.9 million, unsecured senior notes of $1.8 billion, unsecured notes payable of $597,000, and deferred financing costs, net of premiums, on the remaining loans of $541,000.

(3)The aggregate cost of these assets for federal income tax purposes was approximately $3.7 billion as of December 31, 2022.

(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, 2022.

(7)Under development as of December 31, 2022.

(8)Classified as held for sale as of December 31, 2022.

The following table summarizes our changes in cost of properties for the years ended December 31, 2022, 2021 and 2020 (in thousands):


	2022		2021		2020
Beginning balance	$	4,959,709	$	4,686,802	$	4,348,006

Improvements and other additions	350,702		342,684		405,940
Sales (1)	(323,874)		(103,097)		(65,475)
Impairments	—		—		(1,530)
Other dispositions	—		(4,511)		(139)
Reclassification from right-of-use asset	—		37,831		—
Ending balance	$	4,986,537	$	4,959,709	$	4,686,802

The following table summarizes our changes in accumulated depreciation for the same time periods (in thousands):
	2022		2021		2020
Beginning balance	$	1,234,908	$	1,124,253	$	1,007,120
Depreciation expense	124,803		130,604		119,377
Sales (1)	(86,263)		(15,438)		(2,105)

Other dispositions	—		(4,511)		(139)
Ending balance	$	1,273,448	$	1,234,908	$	1,124,253

(1)Includes sales of our wholesale data center and ownership interests in data center shells through newly-formed unconsolidated real estate joint ventures, as described in Note 4 to our consolidated financial statements.