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 | |||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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 |