Exhibit 99.1

DIGITAL REALTY TRUST, INC.

Major Tenants

as of June 30, 2008

		Tenant					Number of Locations		Total Occupied Square Feet (1)		Percentage of Net Rentable Square Feet			Annualized Rent (2)			Percentage of Annualized Rent			Weighted Average Remaining Lease Term in Months
1		Savvis Communications					17		1,693,495		15.4	%		$	42,850		12.7	%		123
2		Qwest Communications International, Inc.					13		770,928		7.0	%			24,226		7.2	%		85
3		Equinix Operating Company, Inc.					4		454,672		4.2	%			13,303		3.9	%		101
4		AT & T					11		385,184		3.5	%			11,402		3.4	%		71
5		TelX Group, Inc.					10		90,210		0.8	%			11,106		3.3	%		221
6		NTT Communications Company					2		241,370		2.2	%			7,464		2.2	%		51
7		Comverse Technology, Inc.					1		367,033		3.3	%			7,056		2.1	%		31
8		JPMorgan Chase & Co.					2		27,377		0.3	%			6,960		2.1	%		99
9		Microsoft Corporation					2		308,726		2.8	%			6,795		2.0	%		85
10		Facebook, Inc.					2		114,008		1.0	%			6,384		1.9	%		102
11		Yahoo! Inc.		(3	)		2		110,847		1.0	%			6,298		1.9	%		112
12		Level 3 Communications, LLC		(4	)		14		289,788		2.7	%			5,934		1.7	%		41
13		Amazon					3		164,847		1.5	%			5,803		1.7	%		135
14		Amgen, Inc.					1		131,386		1.2	%			5,726		1.7	%		83
15		AboveNet, Inc.					10		150,661		1.4	%			5,715		1.7	%		121
		Total/Weighted Average							5,300,532		48.3	%		$	167,022		49.5	%		96

(1) Occupied square footage is defined as leases that have commenced on or before June 30, 2008.

(2) Annualized rent represents the monthly contractual rent under existing leases as of June 30, 2008 multiplied by 12.

(3) Includes 100% of the square footage from a property owned by a consolidated joint venture, of which we own a 50% interest.

(4) Level 3 Communications includes Wiltel Communications & Broadwing Communications.