

				Initial Cost to Company						Cost Amount Carried at Close of Period
Property	City	State	Encumbrances(1)	Land	Buildings and Improvements	Costs Capitalized Subsequent to Acquisition, Net		Impairment/Write Downs		Land	Buildings and Improvements	Total(2)	Accumulated Depreciation(3)	Date Acquired	Original Construction Date
785 Schilinger Road South	Mobile	AL	—	1,540	9,732	(3	)	—		1,540	9,729	11,269	1,990	10/22/2007	1998
Parkshore Plaza	Folsom	CA	41,275	4,370	41,749	3,063		(3	)	4,370	44,809	49,179	5,086	6/16/2011	1999
Leased Land	Gonzalez	CA	—	18,941	9,060	3,967		—		18,940	13,028	31,968	2,862	8/31/2010	-
Sky Park Centre	San Diego	CA	—	936	8,094	756		—		936	8,850	9,786	3,308	6/24/2002	1986
9110 East Nichols Avenue	Centennial	CO	—	1,708	14,616	4,002		—		1,708	18,618	20,326	6,438	11/2/2001	1984
1225 Seventeenth Street	Denver	CO	—	22,400	110,090	17,269		—		22,400	127,359	149,759	21,595	6/24/2009	1982
5073, 5075, & 5085 S. Syracuse Street	Denver	CO	—	4,720	58,890	—		—		4,720	58,890	63,610	8,343	4/16/2010	2007
1601 Dry Creek Drive	Longmont	CO	—	3,714	24,397	5,535		—		3,715	29,931	33,646	9,165	10/26/2004	1982
97 Newberry Road	East Windsor	CT	6,375	2,960	12,360	30		—		2,943	12,407	15,350	2,865	10/24/2006	1989
33 Stiles Lane	North Haven	CT	2,785	2,090	9,141	216		(1,654	)	1,799	7,994	9,793	2,161	10/24/2006	1970
1250 H Street, NW	Washington	DC	—	5,975	53,778	10,947		(2	)	5,975	64,723	70,698	26,030	6/23/1998	1992
Georgetown-Green and Harris Buildings	Washington	DC	—	24,000	35,979	44		—		24,000	36,023	60,023	5,700	9/3/2009	1960;1975
802 Delaware Avenue	Wilmington	DE	—	4,409	39,681	10,533		(11,156	)	3,390	40,077	43,467	23,091	7/23/1998	1986
6600 North Military Trail	Boca Raton	FL	—	15,900	129,790	123		—		15,900	129,913	145,813	16,224	1/11/2011	2008
Executive Park	Atlanta	GA	—	13,729	78,032	6,776		(54,313	)	10,954	33,270	44,224	14,859	7/16/2004; 7/26/2007	1972
633 Ahua Street	Honolulu	HI	—	1,256	3	18,054		(2,912	)	1,100	15,301	16,401	3,765	12/5/2003	2006
625 Crane Street	Aurora	IL	—	1,180	3,411	(2	)	(2,978	)	533	1,078	1,611	87	4/2/2007	1977
1200 Lakeside Drive	Bannockburn	IL	—	5,846	48,568	14,768		(7,610	)	5,858	55,714	61,572	12,601	12/29/2005	1999
600 West Chicago Avenue	Chicago	IL	—	34,980	315,643	12,058		—		34,980	327,701	362,681	35,679	8/10/2011	1908
8750 Bryn Mawr Avenue	Chicago	IL	—	6,600	77,764	7,400		(170	)	6,600	84,994	91,594	11,705	10/28/2010	1985
101-115 W. Washington Street	Indianapolis	IN	—	7,495	60,465	23,210		—		7,496	83,674	91,170	23,976	5/10/2005	1977
111 Monument Circle	Indianapolis	IN	—	9,670	158,085	8,556		—		9,670	166,641	176,311	13,115	10/22/2012	1959;1990
109 Brookline Avenue	Boston	MA	—	3,168	30,397	12,684		—		3,168	43,081	46,249	18,718	9/28/1995	1915
Cabot Business Park Land	Mansfield	MA	—	1,033	—	—		—		1,033	—	1,033	—	8/1/2003	-
111 Market Place	Baltimore	MD	—	6,328	54,645	16,152		—		6,328	70,797	77,125	24,753	1/28/2003	1990
25 S. Charles Street	Baltimore	MD	—	2,830	22,996	12,678		—		2,830	35,674	38,504	12,479	7/16/2004	1972
820 W. Diamond	Gaithersburg	MD	—	4,381	18,798	10,538		(35	)	4,461	29,221	33,682	11,487	3/31/1997	1995
Danac Stiles Business Park	Rockville	MD	—	7,638	62,572	6,329		(10,975	)	6,595	58,969	65,564	18,984	7/20/2004	2002



				Initial Cost to Company						Cost Amount Carried at Close of Period
Property	City	State	Encumbrances(1)	Land	Buildings and Improvements	Costs Capitalized Subsequent to Acquisition, Net		Impairment/Write Downs		Land	Buildings and Improvements	Total(2)	Accumulated Depreciation(3)	Date Acquired	Original Construction Date
East Eisenhower Parkway	Ann Arbor	MI	—	6,760	46,988	1,513		—		6,760	48,501	55,261	6,836	6/15/2010	1975;2006
2250 Pilot Knob Road	Mendota Heights	MN	—	533	4,795	1,202		—		533	5,997	6,530	2,643	3/19/1998	1995
411 Farwell Avenue	South St. Paul	MN	—	1,303	10,451	4,603		—		1,304	15,053	16,357	3,526	6/2/2004	1970
6200 Glenn Carlson Drive	St. Cloud	MN	—	1,950	13,803	—		—		1,950	13,803	15,753	2,156	10/15/2009	1999
4700 Belleview Avenue	Kansas City	MO	—	1,165	3,097	2,895		—		1,165	5,992	7,157	1,029	7/17/2008	1986
111 River Street (4)	Hoboken	NJ	—	—	134,199	1,871		—		—	136,070	136,070	21,630	8/11/2009	2002
North Point Office Complex	Cleveland	OH	—	12,000	94,448	18,136		—		12,000	112,584	124,584	22,363	2/12/2008	1985;1989;1990
Raintree Industrial Park	Solon	OH	—	1,808	16,620	2,270		(8,387	)	1,339	10,972	12,311	858	7/16/2004	1975
401 Vine Street	Delmont	PA	—	1,575	5,542	—		—		1,575	5,542	7,117	1,130	10/22/2007	1999
Cherrington Corporate Center	Moon Township	PA	—	11,369	39,892	28,367		(5,454	)	11,164	63,010	74,174	21,480	9/14/1998; 8/23/1999	1987;1988; 1989;1990; 1991;1992; 1994
1500 Market Street	Philadelphia	PA	—	18,758	167,487	104,542		(388	)	18,758	271,641	290,399	78,551	10/10/2002	1974
1525 Locust Street	Philadelphia	PA	—	931	8,377	1,902		—		930	10,280	11,210	4,122	6/11/1999	1987
1600 Market Street	Philadelphia	PA	—	3,462	111,946	18,259		—		3,462	130,205	133,667	55,534	3/30/1998	1983
1735 Market Street	Philadelphia	PA	169,612	24,753	222,775	52,107		—		24,747	274,888	299,635	121,238	6/30/1998	1990
Foster Plaza	Pittsburgh	PA	—	6,168	51,588	17,969		—		6,171	69,554	75,725	19,771	9/16/2005	1987;1990; 1994; 1995; 1996
128 Crews Drive	Columbia	SC	—	2,420	4,017	1,322		(4,012	)	1,024	2,723	3,747	489	4/2/2007	1968
111 Southchase Boulevard	Fountain Inn	SC	—	520	6,822	1,734		(2,912	)	390	5,774	6,164	1,531	5/23/2007	1987
1043 Global Avenue	Graniteville	SC	—	720	15,552	603		—		720	16,155	16,875	3,537	4/2/2007	1998
633 Frazier Drive	Franklin	TN	—	5,800	13,190	(10	)	—		5,800	13,180	18,980	2,711	10/22/2007	1999
1601 Rio Grande Street	Austin	TX	—	688	6,192	1,539		(23	)	697	7,699	8,396	3,106	6/3/1999	1985
206 East 9th Street	Austin	TX	27,515	7,900	38,533	2,166		—		7,900	40,699	48,599	3,702	5/31/2012	1984
4515 Seton Center Parkway	Austin	TX	—	2,038	18,338	2,731		—		2,037	21,070	23,107	9,110	10/8/1999	1997
4516 Seton Center Parkway	Austin	TX	—	2,028	18,251	3,022		—		2,027	21,274	23,301	9,681	10/8/1999	1985
7800 Shoal Creek Boulevard	Austin	TX	—	1,731	14,921	4,614		(14	)	1,731	19,521	21,252	7,672	6/30/1999	1974
812 San Antonio Street	Austin	TX	—	626	5,636	2,564		—		621	8,205	8,826	3,115	8/18/1999	1987
8701 N Mopac	Austin	TX	—	1,574	14,168	2,677		—		1,573	16,846	18,419	6,751	8/3/1999	1982
Bridgepoint Parkway	Austin	TX	—	7,784	70,526	10,214		(97	)	7,785	80,642	88,427	37,559	12/5/1997	1986;1996;1997



					Initial Cost to Company										Cost Amount Carried at Close of Period
Property	City	State	Encumbrances(1)		Land		Buildings and Improvements		Costs Capitalized Subsequent to Acquisition, Net			Impairment/Write Downs			Land		Buildings and Improvements		Total(2)		Accumulated Depreciation(3)		Date Acquired	Original Construction Date
Lakewood on the Park	Austin	TX	—		3,548		31,936		1,704			(77		)	3,548		33,563		37,111		14,554		10/20/1998	1998
Research Park	Austin	TX	—		15,859		60,175		14,601			—			18,411		72,224		90,635		29,564		10/7/1998	1968;1998; 2001
9840 Gateway Boulevard North	El Paso	TX	—		1,700		9,736		(4		)	—			1,700		9,732		11,432		1,996		10/22/2007	1999
3003 South Expressway 281	Hidalgo	TX	—		1,480		15,533		(9		)	—			1,480		15,524		17,004		3,193		10/22/2007	1999
3330 N Washington Boulevard	Arlington	VA	—		810		7,289		724			—			811		8,012		8,823		3,304		8/26/1998	1987
333 108th Avenue NE	Bellevue	WA	—		14,400		136,412		1,745			—			14,400		138,157		152,557		22,060		11/12/2009	2008
600 108th Avenue NE	Bellevue	WA	—		3,555		30,244		14,252			—			3,555		44,496		48,051		11,904		7/16/2004	1980
1331 North Center Parkway	Kennewick	WA	—		1,850		7,339		(2		)	—			1,850		7,337		9,187		1,506		10/22/2007	1999
100 East Wisconsin Avenue	Milwaukee	WI	—		3,150		72,113		7,733			—			3,150		79,846		82,996		11,433		8/11/2010	1989
111 East Kilbourn Avenue	Milwaukee	WI	—		2,400		47,562		5,143			—			2,400		52,705		55,105		10,528		6/12/2008	1988
			$	247,562	$	394,913	$	3,065,229	$	540,382		$	(113,172	)	$	389,410	$	3,497,942	$	3,887,352	$	898,939

Analysis of the carrying amount of real estate properties and accumulated depreciation:



	Real Estate Properties			Accumulated Depreciation
Balance at January 1, 2013	$	7,829,409		$	1,007,606
Additions(5)	231,485			176,777
Loss on asset impairment	(384,141		)	(185,795		)
Deconsolidation of SIR	(1,446,781		)	(56,023		)
Properties reclassified to discontinued operations	(552,024		)	(15,471		)
Disposals	(140,783		)	(32,035		)
Balance at December 31, 2013	5,537,165			895,059
Additions(5)	70,963			164,815
Loss on asset impairment	(191,490		)	(6,423		)
Properties reclassified to continuing operations	341,024			5,724
Disposals	(29,219		)	(28,730		)
Balance at December 31, 2014	5,728,443			1,030,445
Additions(5)	68,118			144,844
Loss on asset impairment	(17,162		)	—
Disposals	(1,892,047		)	(276,350		)
Balance at December 31, 2015	$	3,887,352		$	898,939


(1)	Excludes net unamortized premiums and discounts.


(2)	Excludes value of real estate intangibles. Aggregate cost for federal income tax purposes is approximately $4,160,805.


(3)	Depreciation is calculated using the straight line method over estimated useful lives of up to 40 years for buildings and improvements and up to 12 years for personal property.


(4)	Property is subject to a ground lease.


(5)	Includes adjustments to real estate properties additions of $(13,217), $(20,445) and $(40,020), and adjustments to accumulated depreciation additions of $(887), $(1,279) and $(1,528), related to changes in foreign currency exchange rates during 2015, 2014 and 2013, respectively.