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Organization (Details) (USD $)
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6 Months Ended | 60 Months Ended | 3 Months Ended | |||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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Jun. 30, 2013
Y
acre
Vehicles
sqft
|
Jun. 30, 2012
|
Jun. 30, 2013
Commercial Real Estate Properties [Member]
sqft
Real_Estate_Properties
|
Jun. 30, 2013
Total Properties Under Construction [ Member]
Real_Estate_Properties
sqft
|
Jun. 30, 2013
Total Office Properties [ Member]
Real_Estate_Properties
|
Jun. 30, 2013
Class A Office Properties [Member]
Real_Estate_Properties
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Jun. 30, 2013
Office Properties Under Construction [ Member]
Real_Estate_Properties
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Jun. 30, 2013
Office Technical Properties [Member]
Real_Estate_Properties
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Jun. 30, 2013
Hotel Property [ Member]
Real_Estate_Properties
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Jun. 30, 2013
Retail Properties [ Member]
Real_Estate_Properties
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Jun. 30, 2013
Residential Properties [Member]
Real_Estate_Properties
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Jun. 30, 2013
Residential Properties Under Construction [Member]
Real_Estate_Properties
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Mar. 26, 2018
Series B Cumulative Redeemable Preferred Stock [Member]
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Jun. 30, 2013
Series B Cumulative Redeemable Preferred Stock [Member]
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Dec. 31, 2012
Series B Cumulative Redeemable Preferred Stock [Member]
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Jun. 30, 2013
Depository shares of Series B Cumulative Redeemable Preferred [Member]
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Jun. 30, 2013
Series Two Preferred Units [Member]
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Jun. 30, 2013
series four preferred units [Member]
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Aug. 07, 2013
series four preferred units [Member]
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Jun. 30, 2013
Series B Preferred Units [Member]
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| Real Estate Properties [Line Items] | ||||||||||||||||||||
| General and limited partnership interest in the operating partnership (percent) | 89.20% | 88.50% | ||||||||||||||||||
| Restriction on redemption of OP units from date of issuance (years) | 1 | |||||||||||||||||||
| One OP unit is equivalent to one share of Common Stock (in shares) | 1 | |||||||||||||||||||
| OP unit conversion rate (in shares) | 1 | |||||||||||||||||||
| Series B, Shares Outstanding | 80,000 | 0 | 8,000,000 | 80,000 | ||||||||||||||||
| Series B, Dividend Rate, Percentage | 5.25% | |||||||||||||||||||
| Number Of Series Of Preferred Units Outstanding | 3 | |||||||||||||||||||
| OP Units for each Preferred Unit (in shares) | 1.312336 | |||||||||||||||||||
| Preferred Units Liquidation Preference | $ 50.00 | $ 50.00 | $ 50.00 | |||||||||||||||||
| Quarterly Distributions to Series Four Preferred Units | $ 0.25 | |||||||||||||||||||
| Series Four Preferred Units Annual Dividend Payable Rate | 2.00% | |||||||||||||||||||
| Number of real estate properties | 179 | 8 | 171 | 131 | 7 | 40 | 1 | 4 | 3 | 1 | ||||||||||
| Net Rentable Area | 44,800,000 | 2,800,000 | ||||||||||||||||||
| Number of vehicles in structured parking | 46,411 | |||||||||||||||||||
| Area of parking (in square feet) | 15,700,000 | |||||||||||||||||||
| Area of undeveloped land parcels owned (in acres) | 512.8 | |||||||||||||||||||