SCHEDULE III REAL ESTATE AND ACCUMULATED DEPRECIATION

12 Months Ended

Dec. 31, 2019

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 to Company				Costs Capitalized Subsequent to Acquisition						Cost amount carried at Close of Period
Property	Location	Number of Properties	Encumbrances ⁽¹⁾		Land		Buildings and Equipment		Costs Capitalized Subsequent to Acquisition			Impairments/ Writedowns			Land		Buildings and Equipment		Total ⁽²⁾		Accumulated Depreciation ⁽³⁾			Date(s) Acquired	Original Construction Date(s)
Inverness Center	Birmingham, AL	3	$	—	$	5,907	$	12,098	$	1,372		$	—		$	5,907	$	13,470	$	19,377	$	(425	)	12/31/2018	1984
445 Jan Davis Drive	Huntsville, AL	1	—		1,501		1,492		—			—			1,501		1,492		2,993		(40		)	12/31/2018	2007
4905 Moores Mill Road	Huntsville, AL	1	—		4,592		36,324		1,627			—			4,592		37,951		42,543		(1,093		)	12/31/2018	1979
131 Clayton Street	Montgomery, AL	1	—		920		9,084		216			—			920		9,300		10,220		(1,942		)	6/22/2011	2007
4344 Carmichael Road	Montgomery, AL	1	—		1,374		11,658		233			—			1,374		11,891		13,265		(1,752		)	12/17/2013	2009
15451 North 28th Avenue	Phoenix, AZ	1	—		1,917		7,416		625			—			1,917		8,041		9,958		(1,054		)	9/10/2014	1996
16001 North 28th Avenue	Phoenix, AZ	1	—		3,355		412		44			—			3,355		456		3,811		(14		)	12/31/2018	1998
711 S 14th Avenue	Safford, AZ	1	—		460		11,708		790			(4,440		)	364		8,154		8,518		(454		)	6/16/2010	1992
Regents Center	Tempe, AZ	2	—		4,121		3,042		—			—			4,121		3,042		7,163		(149		)	12/31/2018	1988
Campbell Place	Carlsbad, CA	2	—		5,769		3,871		549			—			5,769		4,420		10,189		(115		)	12/31/2018	2007
Folsom Corporate Center	Folsom, CA	1	—		2,904		5,583		—			—			2,904		5,583		8,487		(174		)	12/31/2018	2008
Bayside Technology Park	Fremont, CA	1	—		10,784		648		(1		)	—			10,784		647		11,431		(21		)	12/31/2018	1990
5045 East Butler Street	Fresno, CA	1	—		7,276		61,118		139			—			7,276		61,257		68,533		(26,566		)	8/29/2002	1971
10949 N. Mather Boulevard	Rancho Cordova, CA	1	—		562		16,923		916			—			562		17,839		18,401		(2,655		)	10/30/2013	2012
11020 Sun Center Drive	Rancho Cordova, CA	1	—		1,466		8,797		1,401			—			1,466		10,198		11,664		(808		)	12/20/2016	1983
100 Redwood Shores Parkway	Redwood City, CA	1	—		14,454		7,721		—			—			14,454		7,721		22,175		(214		)	12/31/2018	1993
3875 Atherton Road	Rocklin, CA	1	—		177		853		—			—			177		853		1,030		(23		)	12/31/2018	1991
801 K Street	Sacramento, CA	1	—		4,688		61,994		7,087			—			4,688		69,081		73,769		(8,306		)	1/29/2016	1989
9815 Goethe Road	Sacramento, CA	1	—		1,450		9,465		1,523			—			1,450		10,988		12,438		(2,307		)	9/14/2011	1992
Capitol Place	Sacramento, CA	1	—		2,290		35,891		9,822			—			2,290		45,713		48,003		(12,081		)	12/17/2009	1988
4560 Viewridge Road	San Diego, CA	1	—		4,269		18,316		4,319			—			4,347		22,557		26,904		(11,467		)	3/31/1997	1996
2115 O’Nel Drive	San Jose, CA	1	—		12,305		5,062		—			—			12,305		5,062		17,367		(140		)	12/31/2018	1984
North First Street	San Jose, CA	1	—		8,311		4,003		188			—			8,311		4,191		12,502		(116		)	12/31/2018	1984
Rio Robles Drive	San Jose, CA	3	—		23,687		13,698		614			—			23,687		14,312		37,999		(403		)	12/31/2018	1984
2450 and 2500 Walsh Avenue	Santa Clara, CA	2	—		13,374		16,651		—			—			13,374		16,651		30,025		(461		)	12/31/2018	1982
3250 and 3260 Jay Street	Santa Clara, CA	2	—		19,899		14,051		—			—			19,899		14,051		33,950		(390		)	12/31/2018	1982
603 San Juan Avenue	Stockton, CA	1	—		563		5,470		—			—			563		5,470		6,033		(1,015		)	7/20/2012	2012
350 West Java Drive	Sunnyvale, CA	1	—		24,609		462		21			—			24,609		483		25,092		(14		)	12/31/2018	1984
7958 South Chester Street	Centennial, CO	1	—		6,682		7,153		105			—			6,682		7,258		13,940		(200		)	12/31/2018	2000
350 Spectrum Loop	Colorado Springs, CO	1	—		3,650		7,732		86			—			3,650		7,818		11,468		(219		)	12/31/2018	2000



				Initial Cost to Company		Costs Capitalized Subsequent to Acquisition		Cost amount carried at Close of Period
Property	Location	Number of Properties	Encumbrances ⁽¹⁾	Land	Buildings and Equipment	Costs Capitalized Subsequent to Acquisition	Impairments/ Writedowns	Land	Buildings and Equipment	Total ⁽²⁾	Accumulated Depreciation ⁽³⁾		Date(s) Acquired	Original Construction Date(s)
333 Inverness Drive South	Englewood, CO	1	—	5,711	4,543	—	—	5,711	4,543	10,254	(136	)	12/31/2018	1998
12795 West Alameda Parkway	Lakewood, CO	1	1,687	2,640	23,777	1,339	—	2,640	25,116	27,756	(6,195	)	1/15/2010	1988
Corporate Center	Lakewood, CO	3	—	2,887	27,537	3,889	—	2,887	31,426	34,313	(13,409	)	10/11/2002	1980
11 Dupont Circle, NW	Washington, DC	1	64,686	28,255	44,743	5,095	—	28,255	49,838	78,093	(3,366	)	10/2/2017	1974
1211 Connecticut Avenue, NW	Washington, DC	1	26,542	30,388	24,667	2,168	—	30,388	26,835	57,223	(1,793	)	10/2/2017	1967
1401 K Street, NW	Washington, DC	1	24,502	29,215	34,656	4,461	—	29,215	39,117	68,332	(2,910	)	10/2/2017	1929
20 Massachusetts Avenue	Washington, DC	1	—	12,009	51,527	21,755	—	12,223	73,068	85,291	(37,223	)	3/31/1997	1996
440 First Street, NW	Washington, DC	1	—	27,903	38,624	1,332	—	27,903	39,956	67,859	(2,339	)	10/2/2017	1982
625 Indiana Avenue	Washington, DC	1	—	26,000	25,955	8,491	—	26,000	34,446	60,446	(8,694	)	8/17/2010	1989
840 First Street, NE	Washington, DC	1	33,219	42,727	73,278	2,222	—	42,727	75,500	118,227	(4,303	)	10/2/2017	2003
10350 NW 112th Avenue	Miami, FL	1	—	4,798	2,757	—	—	4,798	2,757	7,555	(76	)	12/31/2018	2002
7850 Southwest 6th Court	Plantation, FL	1	—	4,800	30,592	383	—	4,800	30,975	35,775	(6,808	)	5/12/2011	1999
8900 Grand Oak Circle	Tampa, FL	1	—	1,100	11,773	427	—	1,100	12,200	13,300	(2,787	)	10/15/2010	1994
180 Ted Turner Drive SW	Atlanta, GA	1	—	5,717	20,017	295	—	5,717	20,312	26,029	(3,747	)	7/25/2012	2007
Corporate Square	Atlanta, GA	5	—	3,996	29,762	27,962	—	3,996	57,724	61,720	(15,442	)	7/16/2004	1967
Executive Park	Atlanta, GA	1	—	1,521	11,826	4,041	—	1,521	15,867	17,388	(6,437	)	7/16/2004	1972
One Georgia Center	Atlanta, GA	1	—	10,250	27,933	9,227	—	10,250	37,160	47,410	(6,646	)	9/30/2011	1968
One Primerica Parkway	Duluth, GA	1	—	6,927	22,951	—	—	6,927	22,951	29,878	(636	)	12/31/2018	2013
4712 Southpark Boulevard	Ellenwood, GA	1	—	1,390	19,635	118	—	1,390	19,753	21,143	(3,653	)	7/25/2012	2005
91-209 Kuhela Street	Kapolei, HI	1	—	1,998	—	10	—	1,998	10	2,008	—		12/31/2018	Land
8305 NW 62nd Avenue	Johnston, IA	1	—	2,649	7,997	—	—	2,649	7,997	10,646	(221	)	12/31/2018	2011
1185, 1249 & 1387 S. Vinnell Way	Boise, ID	3	—	3,390	29,026	935	—	3,390	29,961	33,351	(5,684	)	9/11/2012	1996; 1997; 2002
2020 S. Arlington Heights	Arlington Heights, IL	1	—	1,450	13,588	444	—	1,450	14,032	15,482	(3,467	)	12/29/2009	1988
400 South Jefferson Street	Chicago, IL	1	49,299	19,379	20,115	—	—	19,379	20,115	39,494	(558	)	12/31/2018	1947
1415 West Diehl Road	Naperville, IL	1	—	12,333	20,586	776	—	12,333	21,362	33,695	(636	)	12/31/2018	2001
440 North Fairway Drive	Vernon Hills, IL	1	—	4,465	441	—	—	4,465	441	4,906	(13	)	12/31/2018	1,992
7601 and 7635 Interactive Way	Indianapolis, IN	2	—	3,337	14,522	26	—	3,337	14,548	17,885	(376	)	12/31/2018	2003
Intech Park	Indianapolis, IN	3	—	4,170	69,759	7,050	—	4,170	76,809	80,979	(15,777	)	10/14/2011	2000; 2001; 2008



				Initial Cost to Company		Costs Capitalized Subsequent to Acquisition			Cost amount carried at Close of Period
Property	Location	Number of Properties	Encumbrances ⁽¹⁾	Land	Buildings and Equipment	Costs Capitalized Subsequent to Acquisition	Impairments/ Writedowns		Land	Buildings and Equipment	Total ⁽²⁾	Accumulated Depreciation ⁽³⁾		Date(s) Acquired	Original Construction Date(s)
The Atrium at Circleport II	Erlanger, KY	1	—	1,796	1,933	—	—		1,796	1,933	3,729	(80	)	12/31/2018	1999
7125 Industrial Road	Florence, KY	1	—	1,698	11,722	293	—		1,698	12,015	13,713	(2,074	)	12/31/2012	1980
251 Causeway Street	Boston, MA	1	—	8,130	17,293	3,296	—		8,130	20,589	28,719	(4,708	)	8/17/2010	1987
300 and 330 Billerica Road	Chelmsford, MA	2	—	4,700	—	458	—		4,700	458	5,158	(3	)	12/31/2018	1984
75 Pleasant Street	Malden, MA	1	—	1,050	31,086	856	—		1,050	31,942	32,992	(7,500	)	5/24/2010	2008
25 Newport Avenue	Quincy, MA	1	—	2,700	9,199	1,879	—		2,700	11,078	13,778	(2,464	)	2/16/2011	1985
One Montvale Avenue	Stoneham, MA	1	—	1,670	11,035	2,693	—		1,670	13,728	15,398	(3,101	)	6/16/2010	1945
314 Littleton Road	Westford, MA	1	—	5,691	8,487	41	—		5,691	8,528	14,219	(238	)	12/31/2018	2007
Annapolis Commerce Center	Annapolis, MD	2	—	4,057	7,665	370	—		4,057	8,035	12,092	(523	)	10/2/2017	1989
4201 Patterson Avenue	Baltimore, MD	1	—	901	8,097	4,099	(85	)	892	12,120	13,012	(5,401	)	10/15/1998	1989
7001 Columbia Gateway Drive	Columbia, MD	1	—	5,642	10,352	—	—		5,642	10,352	15,994	(305	)	12/31/2018	2008
Hillside Center	Columbia, MD	2	—	3,437	4,228	576	—		3,437	4,804	8,241	(277	)	10/2/2017	2001
TenThreeTwenty	Columbia, MD	1	—	3,126	16,361	1,537	—		3,126	17,898	21,024	(1,177	)	10/2/2017	1982
3300 75th Avenue	Landover, MD	1	—	4,110	36,371	1,513	—		4,110	37,884	41,994	(9,310	)	2/26/2010	1985
2115 East Jefferson Street	Rockville, MD	1	—	3,349	11,152	436	—		3,349	11,588	14,937	(1,815	)	8/27/2013	1981
Redland 520/530	Rockville, MD	3	—	12,714	61,377	1,744	—		12,714	63,121	75,835	(3,541	)	10/2/2017	2008
Redland 540	Rockville, MD	1	—	10,740	17,714	6,001	—		10,740	23,715	34,455	(1,909	)	10/2/2017	2003
Rutherford Business Park	Windsor Mill, MD	1	—	1,598	10,219	472	—		1,598	10,691	12,289	(1,845	)	11/16/2012	1972
3550 Green Court	Ann Arbor, MI	1	—	3,630	4,857	—	—		3,630	4,857	8,487	(142	)	12/31/2018	1998
11411 E. Jefferson Avenue	Detroit, MI	1	—	630	18,002	451	—		630	18,453	19,083	(4,402	)	4/23/2010	2009
Rosedale Corporate Plaza	Roseville, MN	1	—	672	6,045	1,526	—		672	7,571	8,243	(3,759	)	12/1/1999	1987
1300 Summit Street	Kansas City, MO	1	—	2,776	12,070	1,143	—		2,776	13,213	15,989	(2,399	)	9/27/2012	1998
2555 Grand Boulevard	Kansas City, MO	1	—	4,085	51,399	472	—		4,085	51,871	55,956	(1,408	)	12/31/2018	2003
4241-4300 NE 34th Street	Kansas City, MO	1	—	1,443	6,193	4,180	—		1,780	10,036	11,816	(4,523	)	3/31/1997	1995
1220 Echelon Parkway	Jackson, MS	1	—	440	25,458	258	—		440	25,716	26,156	(4,760	)	7/25/2012	2009
2300 and 2400 Yorkmont Road	Charlotte, NC	2	—	1,334	19,075	1,387	—		1,334	20,462	21,796	(587	)	12/31/2018	1995
18010 and 18020 Burt Street	Omaha, NE	2	—	6,977	12,500	—	—		6,977	12,500	19,477	(346	)	12/31/2018	2012
500 Charles Ewing Boulevard	Ewing, NJ	1	—	4,808	26,002	—	—		4,808	26,002	30,810	(721	)	12/31/2018	2012



				Initial Cost to Company		Costs Capitalized Subsequent to Acquisition		Cost amount carried at Close of Period
Property	Location	Number of Properties	Encumbrances ⁽¹⁾	Land	Buildings and Equipment	Costs Capitalized Subsequent to Acquisition	Impairments/ Writedowns	Land	Buildings and Equipment	Total ⁽²⁾	Accumulated Depreciation ⁽³⁾		Date(s) Acquired	Original Construction Date(s)
299 Jefferson Road	Parsippany, NJ	1	—	4,543	2,914	493	—	4,543	3,407	7,950	(85	)	12/31/2018	2011
One Jefferson Road	Parsippany, NJ	1	—	4,415	5,249	10	—	4,415	5,259	9,674	(143	)	12/31/2018	2009
Airline Corporate Center	Colonie, NY	1	—	790	6,400	406	—	790	6,806	7,596	(1,253	)	6/22/2012	2004
5000 Corporate Court	Holtsville, NY	1	—	6,530	17,711	3,799	—	6,530	21,510	28,040	(4,492	)	8/31/2011	2000
8687 Carling Road	Liverpool, NY	1	—	566	—	—	—	566	—	566	—		12/31/2018	1997
1212 Pittsford - Victor Road	Pittsford, NY	1	—	608	78	530	—	608	608	1,216	(5	)	12/31/2018	1965
2231 Schrock Road	Columbus, OH	1	—	716	217	101	—	716	318	1,034	(10	)	12/31/2018	1999
4600 25th Avenue	Salem, OR	1	—	6,510	17,973	6,658	—	6,510	24,631	31,141	(5,904	)	12/20/2011	1957
8800 Tinicum Boulevard	Philadelphia, PA	1	40,310	5,573	22,686	—	—	5,573	22,686	28,259	(629	)	12/31/2018	2000
9680 Old Bailes Road	Fort Mill, SC	1	—	834	2,944	—	—	834	2,944	3,778	(82	)	12/31/2018	2007
One Memphis Place	Memphis, TN	1	—	1,630	5,645	7,435	—	1,630	13,080	14,710	(2,996	)	9/17/2010	1985
16001 North Dallas Parkway	Addison, TX	2	—	10,158	63,036	331	—	10,158	63,367	73,525	(1,870	)	12/31/2018	1987
Research Park	Austin, TX	2	—	4,258	13,747	536	—	4,258	14,283	18,541	(835	)	12/31/2018	1999
10451 Clay Road	Houston, TX	1	—	5,495	10,253	—	—	5,495	10,253	15,748	(284	)	12/31/2018	2013
202 North Castlegory Road	Houston, TX	1	—	863	5,024	—	—	863	5,024	5,887	(131	)	12/31/2018	2016
6380 Rogerdale Road	Houston, TX	1	—	12,628	6,113	14	—	12,628	6,127	18,755	(170	)	12/31/2018	2006
4221 W. John Carpenter Freeway	Irving, TX	1	—	1,413	2,365	1,737	—	1,413	4,102	5,515	(123	)	12/31/2018	1995
8675,8701-8711 Freeport Pkwy and 8901 Esters Boulevard	Irving, TX	3	—	10,185	31,566	—	—	10,185	31,566	41,751	(875	)	12/31/2018	1990
1511 East Common Street	New Braunfels, TX	1	—	4,965	1,266	67	—	4,965	1,333	6,298	(35	)	12/31/2018	2005
2900 West Plano Parkway	Plano, TX	1	—	6,819	8,831	—	—	6,819	8,831	15,650	(244	)	12/31/2018	1998
3400 West Plano Parkway	Plano, TX	1	—	4,543	15,964	321	—	4,543	16,285	20,828	(451	)	12/31/2018	1994
3600 Wiseman Boulevard	San Antonio, TX	1	—	3,493	6,662	137	—	3,493	6,799	10,292	(194	)	12/31/2018	2004
701 Clay Road	Waco, TX	1	—	2,030	8,708	9,450	—	2,060	18,128	20,188	(5,351	)	12/23/1997	1997
1800 Novell Place	Provo, UT	1	—	7,487	43,487	—	—	7,487	43,487	50,974	(1,301	)	12/31/2018	2000
4885-4931 North 300 West	Provo, UT	2	—	3,915	9,429	21	—	3,915	9,450	13,365	(276	)	12/31/2018	2009
14660, 14672 & 14668 Lee Road	Chantilly, VA	3	—	6,966	74,214	2,278	—	6,966	76,492	83,458	(5,879	)	12/22/2016	1998; 2002; 2006
1434 Crossways	Chesapeake, VA	2	—	3,617	19,527	2,010	—	3,617	21,537	25,154	(1,749	)	10/2/2017	1998
Greenbrier Towers	Chesapeake, VA	2	—	3,437	11,241	1,457	—	3,437	12,698	16,135	(1,080	)	10/2/2017	1985
Enterchange at Meadowville	Chester, VA	1	—	1,478	9,594	283	—	1,478	9,877	11,355	(1,558	)	8/28/2013	1999
Pender Business Park	Fairfax, VA	4	—	2,487	21,386	1,127	—	2,487	22,513	25,000	(3,530	)	11/4/2013	2000



					Initial Cost to Company				Costs Capitalized Subsequent to Acquisition					Cost amount carried at Close of Period
Property	Location	Number of Properties	Encumbrances ⁽¹⁾		Land		Buildings and Equipment		Costs Capitalized Subsequent to Acquisition		Impairments/ Writedowns			Land		Buildings and Equipment		Total ⁽²⁾		Accumulated Depreciation ⁽³⁾			Date(s) Acquired	Original Construction Date(s)
Three Flint Hill	Fairfax, VA	1	—		5,991		25,536		2,897		—			5,991		28,433		34,424		(2,058		)	10/2/2017	1984
7987 Ashton Avenue	Manassas, VA	1	—		1,562		8,253		694		—			1,562		8,947		10,509		(717		)	1/3/2017	1989
Two Commercial Place	Norfolk, VA	1	—		4,494		21,508		389		—			4,494		21,897		26,391		(563		)	12/31/2018	1974
1759 & 1760 Business Center Drive	Reston, VA	2	—		9,066		78,658		4,093		—			9,066		82,751		91,817		(11,392		)	5/28/2014	1987
1775 Wiehle Avenue	Reston, VA	1	—		4,138		26,120		1,446		—			4,138		27,566		31,704		(1,583		)	10/2/2017	2001
501 South 5th Street	Richmond, VA	1	—		14,767		39,101		230		—			14,767		39,331		54,098		(1,134		)	12/31/2018	2009
9201 Forest Hill Avenue	Richmond, VA	1	—		1,344		375		150		—			1,344		525		1,869		(12		)	12/31/2018	1985
9960 Mayland Drive	Richmond, VA	1	—		2,614		15,930		2,440		—			2,614		18,370		20,984		(2,559		)	5/20/2014	1994
Parham Place	Richmond, VA	3	—		913		1,099		15		—			913		1,114		2,027		(31		)	12/31/2018	1989; 2012
1751 Blue Hills Drive	Roanoke, VA	1	—		2,689		7,761		—		—			2,689		7,761		10,450		(215		)	12/31/2018	2003
Atlantic Corporate Park	Sterling, VA	2	—		5,752		29,316		2,055		—			5,752		31,371		37,123		(1,690		)	10/2/2017	2008
Orbital Sciences Campus	Sterling, VA	3	—		12,275		19,320		25		—			12,275		19,345		31,620		(570		)	12/31/2018	2001
Sterling Business Park Lots 8 and 9	Sterling, VA	1	—		9,177		44,324		52		—			9,177		44,376		53,553		(2,493		)	10/2/2017	2016
65 Bowdoin Street	S. Burlington, VT	1	—		700		8,416		140		—			700		8,556		9,256		(2,090		)	4/9/2010	2009
840 North Broadway	Everett, WA	2	—		3,360		15,376		2,649		—			3,360		18,025		21,385		(3,716		)	6/28/2012	1985
Stevens Center	Richland, WA	2	—		3,970		17,035		4,456		—			4,042		21,419		25,461		(10,658		)	3/31/1997	1995
351, 401, 501 Elliott Ave West	Seattle, WA	3	69,701		26,640		52,740		654		—			26,640		53,394		80,034		(1,467		)	12/31/2018	2000
11050 West Liberty Drive	Milwaukee, WI	1	—		945		4,539		103		—			945		4,642		5,587		(998		)	6/9/2011	2006
5353 Yellowstone Road	Cheyenne, WY	1	—		1,915		8,217		1,346		—			1,950		9,528		11,478		(4,907		)	3/31/1997	1995
		183	$	309,946	$	839,889	$	2,425,029	$	232,838	$	(4,525	)	$	840,550	$	2,652,681	$	3,493,231	$	(387,656	)
Properties Held for Sale														—		—		—		—
1 Targeting Center	Windsor, CT	1	—		1,428		588		—		—			1,428		588		2,016		(13		)	12/31/2018	1980
475 Bond Street	Lincolnshire, IL	1	—		4,764		552		—		—			4,764		552		5,316		(11		)	12/31/2018	2000
50 West State Street	Trenton, NJ	1	—		5,000		38,203		3,337		(18,623		)	3,866		24,051		27,917		—			12/30/2010	1989
3920 Pender Drive	Fairfax, VA	1	13,128		2,934		12,840		538		—			2,934		13,378		16,312		(1,796		)	3/21/2014	1981
Aquia Commerce Center	Stafford, VA	2	—		2,090		7,465		784		—			2,090		8,249		10,339		(1,733		)	6/22/2011	1988; 1999
		6	13,128		16,216		59,648		4,659		(18,623		)	15,082		46,818		61,900		(3,553		)
		189	$	323,074	$	856,105	$	2,484,677	$	237,497	$	(23,148	)	$	855,632	$	2,699,499	$	3,555,131	$	(391,209	)

(1) Represents mortgage debt, net of the unamortized balance of the fair value adjustments and debt issuance costs totaling $3,135.

(2) Excludes the value of real estate intangibles. Aggregate cost for federal income tax purposes is approximately $6,971,434.

(3) Depreciation on building and improvements is provided for periods ranging up to 40 years and on equipment up to 12 years.

An analysis of the carrying amount of real estate properties and accumulated depreciation is as follows:



	Real Estate Properties			Accumulated Depreciation
Balance at December 31, 2016	$	1,888,760		$	296,804
Additions	1,100,138			45,315
Loss on asset impairment	(9,490		)	—
Disposals	(3,687		)	(271		)
Balance at December 31, 2017	2,975,721			341,848
Additions	1,486,342			65,215
Loss on asset impairment	(8,630		)	—
Disposals	(286,837		)	(18,740		)
Cost basis adjustment ⁽¹⁾	(5,005		)	(5,005		)
Reclassification of assets of properties held for sale	(216,955		)	(8,171		)
Balance at December 31, 2018	3,944,636			375,147
Additions	66,221			89,398
Loss on asset impairment	(22,255		)	—
Disposals	(424,302		)	(64,167		)
Cost basis adjustment ⁽¹⁾	(9,169		)	(9,169		)
Reclassification of assets of properties held for sale	(61,900		)	(3,553		)
Balance at December 31, 2019	$	3,493,231		$	387,656

(1)

Represents the reclassification between accumulated depreciation and building made to certain properties reclassified as assets of properties held for sale at fair value in accordance with GAAP.