CoreSite Realty Corporation

Schedule III

Real Estate and Accumulated Depreciation

December 31, 2016


								Gross Amount Carried at
		Initial Cost				Costs Capitalized		December 31, 2016						Accumulated		Year
				Building and		Subsequent to				Building and				Depreciation at		Acquired
Property Name	Location	Land		Improvements		Acquisition		Land		Improvements		Total		December 31, 2016		or Leased
	(In thousands)
BO1	Somerville, MA	$	6,100	$	26,748	$	68,943	$	5,154	$	96,637	$	101,791	$	43,636	2007
CH1	Chicago, IL		5,493		49,522		56,227		5,493		105,749		111,242		28,918	2010
DC1	Washington, DC		—		4,797		3,851		—		8,648		8,648		5,237	2010
DE1	Denver, CO		—		37		9,972		—		10,009		10,009		1,496	2012
DE2	Denver, CO		—		4		1,319		—		1,323		1,323		797	2012
LA1	Los Angeles, CA		—		41,099		33,947		—		75,046		75,046		33,584	2010
LA2	Los Angeles, CA		28,467		94,114		71,900		28,467		166,014		194,481		42,653	2010
MI1	Miami, FL		728		9,325		1,174		728		10,499		11,227		2,771	2010
NY1	New York, NY		—		—		35,581		—		35,581		35,581		19,445	2007
NY2	Secaucus, NJ		4,952		18,408		110,157		2,388		131,129		133,517		14,761	2013
SV1	San Jose, CA		6,863		91,719		39,902		6,863		131,621		138,484		29,694	2010
SV2	Milpitas, CA		5,086		5,046		24,127		5,086		29,173		34,259		17,071	2006
SV3	Santa Clara, CA		4,162		3,482		47,939		3,972		51,611		55,583		29,811	2007
SV4	Santa Clara, CA		4,632		3,716		95,088		4,501		98,935		103,436		30,159	2007
SV5	Santa Clara, CA		2,572		—		23,613		2,544		23,641		26,185		1,895	2007
SV6	Santa Clara, CA		4,741		—		36,852		4,825		36,768		41,593		615	2007
SV7	Santa Clara, CA		3,793		—		235,126		3,595		235,324		238,919		2,606	2007
VA1	Reston, VA		6,903		32,939		89,705		6,903		122,644		129,547		52,542	2007
VA2	Reston, VA		5,197		—		128,169		5,539		127,827		133,366		11,444	2007
Reston Campus Expansion	Reston, VA		14,200		43,949		1,190		14,200		45,139		59,339		168	2016
	Total	$	103,889	$	424,905	$	1,114,782	$	100,258	$	1,543,318	$	1,643,576	$	369,303

None of our properties are encumbered.

The aggregate cost of the total properties for federal income tax purposes was approximately $1,592.6 million (unaudited) at December 31, 2016.

See accompanying report of independent registered public accounting firm.

CoreSite Realty Corporation

Schedule III

Real Estate and Accumulated Depreciation (Continued)

December 31, 2016

The following table reconciles the historical cost and accumulated depreciation of our properties for the years ended December 31, 2016, 2015, and 2014:


	Year Ended December 31,
	2016		2015		2014
	(In thousands)
Property
Balance, beginning of year	$	1,295,135	$	1,146,548	$	1,048,525
Additions - property acquisitions		58,149		—		—
Additions - improvements		290,292		148,587		98,969
Deduction - cost of land disposal		—		—		(946)
Balance, end of year	$	1,643,576	$	1,295,135	$	1,146,548

Accumulated Depreciation
Balance, beginning of year	$	284,219	$	215,978	$	155,704
Additions, net of disposals		85,084		68,241		60,274
Balance, end of year	$	369,303	$	284,219	$	215,978

See accompanying report of independent registered public accounting firm.