

					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
Parkshore Plaza	Folsom	CA	$	41,275	$	4,370	$	41,749	$	5,630		$	(6,310	)	$	3,841	$	41,598	$	45,439	$	6,695	6/16/2011	1999
1225 Seventeenth Street	Denver	CO	—		22,400		110,090		24,798			(485		)	22,400		134,403		156,803		25,990		6/24/2009	1982
5073, 5075, & 5085 S. Syracuse Street	Denver	CO	—		4,720		58,890		—			—			4,720		58,890		63,610		9,815		4/16/2010	2007
1601 Dry Creek Drive	Longmont	CO	—		3,714		24,397		6,439			—			3,715		30,835		34,550		10,012		10/26/2004	1982
97 Newberry Road	East Windsor	CT	5,903		2,960		12,360		30			—			2,943		12,407		15,350		3,175		10/24/2006	1989
33 Stiles Lane	North Haven	CT	2,415		2,090		9,141		216			(1,654		)	1,799		7,994		9,793		2,353		10/24/2006	1970
1250 H Street, NW	Washington	DC	—		5,975		53,778		13,103			(248		)	5,975		66,633		72,608		28,384		6/23/1998	1992
Georgetown-Green and Harris Buildings	Washington	DC	—		24,000		35,979		44			—			24,000		36,023		60,023		6,600		9/3/2009	1960;1975
802 Delaware Avenue	Wilmington	DE	—		4,409		39,681		10,562			(11,156		)	3,390		40,106		43,496		24,217		7/23/1998	1986
6600 North Military Trail	Boca Raton	FL	—		15,900		129,790		118			—			15,900		129,908		145,808		19,471		1/11/2011	2008
625 Crane Street	Aurora	IL	—		1,180		3,411		(2		)	(4,589		)	—		—		—		—		4/2/2007	1977
600 West Chicago Avenue	Chicago	IL	—		34,980		315,643		44,821			—			34,980		360,464		395,444		45,839		8/10/2011	1908
8750 Bryn Mawr Avenue	Chicago	IL	—		6,600		77,764		9,498			(257		)	6,600		87,005		93,605		14,411		10/28/2010	1985
109 Brookline Avenue	Boston	MA	—		3,168		30,397		14,090			(119		)	3,168		44,368		47,536		20,196		9/28/1995	1915
Cabot Business Park Land	Mansfield	MA	—		1,033		—		—			(458		)	575		—		575		—		8/1/2003	-
111 Market Place	Baltimore	MD	—		6,328		54,645		17,781			(7,199		)	5,814		65,741		71,555		27,356		1/28/2003	1990
25 S. Charles Street	Baltimore	MD	—		2,830		22,996		12,678			—			2,830		35,674		38,504		13,640		7/16/2004	1972
820 W. Diamond	Gaithersburg	MD	—		4,381		18,798		10,516			(35		)	4,461		29,199		33,660		12,777		3/31/1997	1995
Danac Stiles Business Park	Rockville	MD	—		7,638		62,572		6,483			(10,975		)	6,595		59,123		65,718		20,919		7/20/2004	2002
East Eisenhower Parkway	Ann Arbor	MI	—		6,760		46,988		2,628			—			6,760		49,616		56,376		8,189		6/15/2010	1975;2006
2250 Pilot Knob Road	Mendota Heights	MN	—		533		4,795		1,202			—			533		5,997		6,530		2,896		3/19/1998	1995
411 Farwell Avenue	South St. Paul	MN	—		1,303		10,451		4,603			—			1,304		15,053		16,357		4,056		6/2/2004	1970
4700 Belleview Avenue	Kansas City	MO	—		1,165		3,097		2,989			(26		)	1,165		6,060		7,225		1,286		7/17/2008	1986
Cherrington Corporate Center	Moon Township	PA	—		11,369		39,892		28,319			(7,616		)	10,664		61,300		71,964		22,494		9/14/1998; 8/23/1999	1987;1988; 1989;1990; 1991;1992; 1994
1500 Market Street	Philadelphia	PA	—		18,758		167,487		119,060			(759		)	18,758		285,788		304,546		88,717		10/10/2002	1974



					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
1600 Market Street	Philadelphia	PA	—		3,462		111,946		20,637		(194		)	3,462		132,389		135,851		59,435		3/30/1998	1983
1735 Market Street	Philadelphia	PA	—		24,753		222,775		67,076		(12,071		)	24,747		277,786		302,533		118,405		6/30/1998	1990
Foster Plaza	Pittsburgh	PA	—		6,168		51,588		20,229		(1,729		)	6,170		70,086		76,256		21,553		9/16/2005	1987;1990; 1994; 1995; 1996
206 East 9th Street	Austin	TX	27,041		7,900		38,533		2,776		(12		)	7,900		41,297		49,197		4,879		5/31/2012	1984
4515 Seton Center Parkway	Austin	TX	—		2,038		18,338		2,814		(60		)	2,037		21,093		23,130		9,749		10/8/1999	1996
4516 Seton Center Parkway	Austin	TX	—		2,028		18,251		4,003		(25		)	2,027		22,230		24,257		10,497		10/8/1999	1998
Bridgepoint Square	Austin	TX	—		7,784		70,526		13,727		(705		)	7,785		83,547		91,332		39,708		12/5/1997	1986;1996;1997
Research Park	Austin	TX	—		15,859		60,175		17,410		—			21,213		72,231		93,444		32,295		10/7/1998	1968;1998; 2001
333 108th Avenue NE	Bellevue	WA	—		14,400		136,412		2,438		(31		)	14,400		138,819		153,219		25,788		11/12/2009	2008
600 108th Avenue NE	Bellevue	WA	—		3,555		30,244		17,305		(508		)	3,555		47,041		50,596		13,458		7/16/2004	1980
			$	76,634	$	286,511	$	2,133,579	$	504,021	$	(67,221	)	$	286,186	$	2,570,704	$	2,856,890	$	755,255

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



	Real Estate Properties			Accumulated Depreciation
Balance at January 1, 2014	$	5,537,165		$	895,059
Additions(4)	70,963			164,815
Loss on asset impairment	(191,490		)	(6,423		)
Properties reclassified to discontinued operations	341,024			5,724
Disposals	(29,219		)	(28,730		)
Balance at December 31, 2014	5,728,443			1,030,445
Additions(4)	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
Additions(4)	113,258			101,647
Loss on asset impairment	(58,595		)	(119		)
Disposals	(1,085,125		)	(245,212		)
Balance at December 31, 2016	$	2,856,890		$	755,255


(1)	Excludes net unamortized premiums and net unamortized deferred financing costs.


(2)	Excludes value of real estate intangibles. Aggregate cost for federal income tax purposes is approximately $2,988,563.


(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)	Includes adjustments related to changes in foreign currency exchange rates for real estate properties additions of $0, $(13,217) and $(20,445), and adjustments to accumulated depreciation additions of $0, $(887) and $(1,279), during 2016, 2015 and 2014, respectively.