Schedule III - Consolidated Real Estate and Accumulated Depreciation (Tables)

12 Months Ended

Dec. 31, 2016

Real Estate and Accumulated Depreciation [Line Items]

Schedule Of Real Estate And Accumulated Depreciation [Table Text Block]

	Encum-brances		Initial Cost at Acquisition / Placement into Service				Costs Capitalized Subsequent to  Acquisition / Placement into Service			Gross Carry Amount at December 31, 2016						Accumulated depreciation at December 31, 2016			Year Built/ Renovated	Year Acquired	Life on which depreciation in latest income statements is computed
			Land		Building and improvements / Construction in progress		Buildings & improvements			Land		Building and improvements / Construction in progress		Total
Operating Properties
ACC2 (1)	$	—	$	2,500	$	157,100	$	(620	)	$	2,500	$	156,480	$	158,980	$	(57,184	)	2005	2001	28.5
ACC3 (2)	111,250		1,071		92,631		3,449			$	1,071	96,080		97,151		(36,136		)	2006	2001	29.8
ACC4 (1)	—		6,600		535,526		3,343			$	6,600	538,869		545,469		(176,477		)	2007	2006	30.8
ACC5 (1)	—		6,443		292,369		6,647			$	6,443	299,016		305,459		(71,347		)	2009-2010	2007	29.7
ACC6 (1)	—		5,518		215,235		1,594			$	5,518	216,829		222,347		(35,197		)	2011-2013	2007	30.7
ACC7	—		9,753		328,520		4,450			$	9,753	332,970		342,723		(13,320		)	2014-2016	2011	32.5
CH1 (1)	—		23,611		357,194		1,977			$	23,611	359,171		382,782		(82,947		)	2008-2012	2007	30.5
CH2	—		14,392		255,593		946			$	14,392	256,539		270,931		(7,239		)	2015-2016	2013	30.7
SC1 Phases I-II (1)	—		20,202		429,572		3,527			$	20,202	433,099		453,301		(53,697		)	2011-2015	2007	31.7
VA3 (1)	—		9,000		172,881		6,813			$	9,000	179,694		188,694		(72,725		)	2003	2003	30.5
VA4 (1)	—		6,800		140,575		9,039			$	6,800	149,614		156,414		(55,914		)	2005	2005	31.1
Subtotal	111,250		105,890		2,977,196		41,165			105,890		3,018,361		3,124,251		(662,183		)
Development Properties
ACC8	—		3,786		466		—			3,786		466		4,252		—				2007
ACC9	—		8,469		138,561		—			8,469		138,561		147,030		—				2016
ACC10	—		7,343		1,872		—			7,343		1,872		9,215		—				2016
ACC11	—		4,773		6		—			4,773		6		4,779		—				2016
CH3	—		8,578		8,740		—			8,578		8,740		17,318		—				2015
OR1	—		5,775		1,328		—			5,775		1,328		7,103		—				2016
OR2	—		5,775		301		—			5,775		301		6,076		—				2016
SC1 Phase III (1)	—		5,232		83,604		—			5,232		83,604		88,836		—				2007
TOR1	—		42,128		4,246		—			42,128		4,246		46,374		—				2016
Subtotal	—		91,859		239,124		—			91,859		239,124		330,983		—
Grand Total (3)	$	111,250	$	197,749	$	3,216,320	$	41,165		$	197,749	$	3,257,485	$	3,455,234	$	(662,183	)

(1) The subsidiaries that own these data centers and development properties are guarantors of the Unsecured Notes due 2021 and 2023, the Unsecured Credit Facility and the Unsecured Term Loan.

(2) The subsidiary that owns this data center is encumbered by our ACC3 Term Loan.

(3) The aggregate gross cost of our properties for federal income tax purposes was $2.78 billion (unaudited) as of December 31, 2016.

Schedule of Reconciliation Of Real Estate Assets and Accumulated Depreciation [Table Text Block]

	2016			2015			2014
Real estate assets
Balance, beginning of period	$	3,132,078		$	3,066,297		$	2,799,010
Additions - property acquisitions	73,273			8,600			—
Additions - improvements	344,960			221,588			267,357
Deductions - write-offs, sales, impairments	(95,077		)	(164,407		)	(70		)
Balance, end of period	$	3,455,234		$	3,132,078		$	3,066,297
Accumulated depreciation
Balance, beginning of period	$	560,837		$	504,869		$	413,394
Additions - depreciation	102,614			97,988			91,545
Deductions - write-offs, sales	(1,268		)	(42,020		)	(70		)
Balance, end of period	$	662,183		$	560,837		$	504,869