Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Investments in Real Estate:
Land	$ 358,146	$ 338,401
Site Improvements	164,721	150,936
Buildings and Improvements	1,017,471	938,640
Tenant Improvements	77,425	74,896
Gross investments in Real Estate	1,617,763	1,502,873
Less: Accumulated Depreciation and Amortization	(120,769)	(88,147)
Net Investments in Real Estate	1,496,994	1,414,726
Investments in Unconsolidated Entities	487,996	537,631
Construction In Progress and Other Assets-Variable Interest Entity	66,354	17,233
Cash and Cash Equivalents	191,409	238,277
Restricted Cash	9,483	7,216
Accounts and Other Receivables, Net of Allowance of $656 and $821, respectively	8,861	5,036
Deferred Rent	23,192	17,719
Acquired Above-Market Leases, Net of Accumulated Amortization of $21,344 and $15,729, respectively	28,978	31,415
Acquired In-Place Lease Value, Net of Accumulated Amortization of $82,617 and $60,861, respectively	150,070	158,655
Deferred Financing Costs, Net of Accumulated Amortization $7,020 and $4,189, respectively	10,695	7,294
Lease Commissions, Net of Accumulated Amortization of $1,490 and $990, respectively	4,220	3,522
Other Assets	3,359	1,976
Total Assets	2,481,611	2,440,700
LIABILITIES
Notes Payable, Less Discount of $2,297 and $2,838, plus premium of $8,061 and $9,595, respectively	619,275	630,146
Note Payable at Fair Value	9,208	8,775
Loan Payable	0	25,000
Security Deposits	1,000	741
Accounts Payable and Accrued Expenses	29,590	20,128
Accounts Payable, Accrued Expenses and Prepaid Rent-Variable Interest Entity	33,683	3,305
Accrued Offering Costs Payable to Related Parties	0	1,974
Acquired Below-Market Leases, Net of Accumulated Amortization of $18,226 and $13,876, respectively	24,857	29,148
Above-Market Ground Lease Obligations, Net of Accumulated Amortization $71 and $18, respectively	1,429	1,483
Property Management Fee Payable to Related Party	310	190
Investment Management Fee Payable to Related Party	2,045	1,968
Distributions Payable	37,374	32,785
Interest Rate Swaps at Fair Value-Non-Qualifying Hedges	606	958
Interest Rate Swaps at Fair Value-Qualifying Hedges	14,002	12,340
Total Liabilities	773,379	768,941
COMMITMENTS AND CONTINGENCIES (NOTE 18) NON-CONTROLLING INTERESTS
Operating Partnership Units	2,464	2,464
Class B Interest	200	0
Non-Controlling Interest-Variable Interest Entity	826	686
Total Liabilities, Non-Controlling Interests and Shareholders' Equity	2,481,611	2,440,700
Common Shares of Beneficial Interest, $0.01 par value, 990,000,000 shares authorized; 249,390,337 and 230,955,633 issued and outstanding as of September 30, 2012 and December 31, 2011, respectively	2,494	2,309
Additional Paid-in-Capital	2,203,812	2,038,566
Accumulated Deficit	(476,498)	(348,602)
Accumulated Other Comprehensive Loss	(25,066)	(23,664)
Total Shareholders' Equity	$ 1,704,742	$ 1,668,609