SCHEDULE III REAL ESTATE AND ACCUMULATED DEPRECIATION

12 Months Ended

Dec. 31, 2020

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								Cost Amount Carried at Close of Period
Property	City	State	Land		Buildings and Improvements		Costs Capitalized Subsequent to Acquisition, Net		Impairment/Write Downs		Land		Buildings and Improvements		Total(1)		Accumulated Depreciation(2)		Date Acquired	Original Construction Date
1225 Seventeenth Street	Denver	CO	$	22,400	$	110,090	$	41,742	$	(3,018)	$	22,400	$	148,814	$	171,214	$	46,258	6/24/2009	1982
1250 H Street, NW	Washington	DC	5,975		53,778		18,917		(2,778)		5,975		69,917		75,892		36,538		6/23/1998	1992
206 East 9th Street	Austin	TX	7,900		38,533		6,872		(837)		7,900		44,568		52,468		10,108		5/31/2012	1984
Bridgepoint Square	Austin	TX	7,785		70,526		27,296		(3,471)		7,785		94,351		102,136		50,415		12/5/1997	1986;1996; 1997
			$	44,060	$	272,927	$	94,827	$	(10,104)	$	44,060	$	357,650	$	401,710	$	143,319

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

	Real Estate Properties		Accumulated Depreciation
Balance at January 1, 2018	$	1,747,611	$	450,718
Additions	58,618		39,161
Loss on asset impairment	(12,032)		—
Disposals	(654,555)		(113,911)
Balance at December 31, 2018	1,139,642		375,968
Additions	13,895		22,697
Disposals	(491,416)		(195,965)
Balance at December 31, 2019	662,121		202,700
Additions	11,642		15,275
Disposals	(272,053)		(74,656)
Balance at December 31, 2020	$	401,710	$	143,319

(1)Excludes value of real estate intangibles. Aggregate cost for federal income tax purposes is approximately $393,044.

(2)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.