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Properties, net (Details 5) (USD $) | 12 Months Ended | 1 Months Ended |  | 1 Months Ended |  | 1 Months Ended |  | 1 Months Ended |  | 12 Months Ended | 1 Months Ended |  | 1 Months Ended | 12 Months Ended |  | 1 Months Ended |  |  |  |  | 1 Months Ended |
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Dec. 31, 2011 2011 Office Property Acquisition | Aug. 31, 2011 2011 Office Property Acquisition 310 The Bridge Street Y sqfeet | Aug. 09, 2011 2011 Office Property Acquisition 310 The Bridge Street | Aug. 31, 2011 2011 Office Property Acquisition 310 The Bridge Street In-place lease value Y | Aug. 09, 2011 2011 Office Property Acquisition 310 The Bridge Street In-place lease value | Aug. 31, 2011 2011 Office Property Acquisition 310 The Bridge Street Tenant relationship value Y | Aug. 09, 2011 2011 Office Property Acquisition 310 The Bridge Street Tenant relationship value | Aug. 31, 2011 2011 Office Property Acquisition 310 The Bridge Street Above-market leases Y | Aug. 09, 2011 2011 Office Property Acquisition 310 The Bridge Street Above-market leases | Dec. 31, 2010 2010 Acquisitions Y | Dec. 31, 2010 2010 Acquisitions In-place lease value Y | Dec. 31, 2010 2010 Acquisitions Tenant relationship value Y | Dec. 31, 2010 2010 Acquisitions Above-market cost arrangements Y | Dec. 31, 2010 2010 Acquisitions Above-market leases Y | Jun. 30, 2010 2010 Acquisitions 1550 Westbranch Drive sqfeet | Jun. 28, 2010 2010 Acquisitions 1550 Westbranch Drive | Sep. 30, 2010 2010 Acquisitions Power Loft @ Innovation megawatt sqfeet tenant | Dec. 31, 2011 2010 Acquisitions Power Loft @ Innovation megawatt | Sep. 14, 2010 2010 Acquisitions Power Loft @ Innovation | Sep. 30, 2010 2010 Acquisitions Maritime Plaza I and II sqfeet property | Sep. 28, 2010 2010 Acquisitions Maritime Plaza I and II | Dec. 31, 2011 2010 Acquisitions Maritime Plaza I and II Mortgage loan maturing in March 2014 | Sep. 30, 2010 2010 Acquisitions Maritime Plaza I and II Mortgage loan maturing in March 2014 | Sep. 28, 2010 2010 Acquisitions Maritime Plaza I and II Mortgage loan maturing in March 2014 | Nov. 30, 2010 2010 Acquisitions 3120 Fairview Park Drive sqfeet | Nov. 23, 2010 2010 Acquisitions 3120 Fairview Park Drive
Acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Square footage of real estate properties (in square feet) |  | 138,000 |  |  |  |  |  |  |  |  |  |  |  |  | 152,000 |  | 233,000 |  |  | 362,000 |  |  |  |  | 183,000 |
Acquired property, percentage leased (as a percent) |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  | 100.00% |  |  | 17.00% |  | 100.00% |  |  |  |  |
Land, operating properties |  |  | $ 261,000 |  |  |  |  |  |  | $ 13,265,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Land, development |  |  |  |  |  |  |  |  |  | 5,545,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Building and improvements |  |  | 26,577,000 |  |  |  |  |  |  | 173,589,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Construction in progress |  |  |  |  |  |  |  |  |  | 85,525,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets on real estate acquistions |  |  | 6,575,000 |  |  |  |  |  |  | 42,896,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total assets |  |  |  |  |  |  |  |  |  | 320,820,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Below-market leases |  |  |  |  |  |  |  |  |  | (231,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total acquisition cost |  |  | 33,413,000 |  |  |  |  |  |  | 320,589,000 |  |  |  |  |  | 40,000,000 |  |  | 115,500,000 |  | 122,100,000 |  |  |  |  | 43,000,000
Number of tenants under lease at acquisition date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |
Combined initial critical load of tenants under lease at acquisition date (in megawatts) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 |  |  |  |  |  |  |  |  |
Combined critical load expansion rights of tenants under lease at acquisition date (in megawatts) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 |  |  |  |  |  |  |  |  |
The expected stabilization critical load after completion of development (in megawatts) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 18 |  |  |  |  |  |  |  |
Expected additional development costs subsequent to acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 160,000,000 |  |  |  |  |  |  |  |
Additional development costs incurred |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 82,300,000 |  |  |  |  |  |  |  |
Number of office properties acquired |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |
Stated amount of debt assumed in connection with acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 70,100,000 |  |  |
Fair value of debt assumed in connection with acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 73,300,000 |  |  |
Stated fixed interest rate (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.35% |  | 5.35% |  |
Effective interest rate (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.95% |  | 3.95% |  |
Cost expensed in connection with acquisition of operating properties | 156,000 |  |  |  |  |  |  |  |  | 3,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets on real estate acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross Carrying Amount |  |  |  |  | $ 2,904,000 |  | $ 3,187,000 |  | $ 484,000 |  | $ 21,616,000 | $ 14,450,000 | $ 6,193,000 | $ 637,000 |  |  |  |  |  |  |  |  |  |  |  |
Weighted average amortization period of intangible assets (in years) |  | 6 |  | 3 |  | 8 |  | 3 |  | 11 | 4 | 10 | 40 | 2 |  |  |  |  |  |  |  |  |  |  |  |

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