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Organization (Details) (USD $)
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9 Months Ended | 9 Months Ended | 9 Months Ended | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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Sep. 30, 2014
sqft
Vehicles
acre
Y
|
Sep. 30, 2013
|
Sep. 30, 2014
Commercial Real Estate Properties [Member]
Real_Estate_Properties
sqft
|
Sep. 30, 2014
Total Properties Under Construction [ Member]
Real_Estate_Properties
sqft
|
Sep. 30, 2014
Total Office Properties [ Member]
Real_Estate_Properties
|
Sep. 30, 2014
Class A Office Properties [Member]
Real_Estate_Properties
|
Sep. 30, 2014
Office Properties Under Construction [ Member]
Real_Estate_Properties
|
Sep. 30, 2014
Office Technical Properties [Member]
Real_Estate_Properties
|
Sep. 30, 2014
Hotel Property [ Member]
Real_Estate_Properties
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Sep. 30, 2014
Retail Properties [ Member]
Real_Estate_Properties
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Sep. 30, 2014
Retail Properties Under Construction [Member]
Real_Estate_Properties
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Sep. 30, 2014
Residential Properties [Member]
Real_Estate_Properties
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Sep. 30, 2014
Series B Cumulative Redeemable Preferred Stock [Member]
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Dec. 31, 2013
Series B Cumulative Redeemable Preferred Stock [Member]
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Sep. 30, 2014
Depository shares of Series B Cumulative Redeemable Preferred [Member]
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Sep. 30, 2014
Series Four Preferred Units [Member]
|
Sep. 30, 2014
Series B Preferred Units [Member]
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| Real Estate Properties [Line Items] | |||||||||||||||||
| Ratio of depository shares to shares of Series B Preferred Stock | 0.01 | ||||||||||||||||
| General and limited partnership interest in the operating partnership (percent) | 89.50% | 89.20% | |||||||||||||||
| 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 | 80,000 | 8,000,000 | 80,000 | |||||||||||||
| Series B, Dividend Rate, Percentage | 5.25% | ||||||||||||||||
| Preferred Units Liquidation Preference | $ 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 | 172 | 10 | 163 | 132 | 9 | 31 | 1 | 5 | 1 | 3 | |||||||
| Net Rentable Area (in sf) | 46,400,000 | 3,300,000 | |||||||||||||||
| Number of vehicles in structured parking | 45,835 | ||||||||||||||||
| Area of parking (in square feet) | 15,700,000 | ||||||||||||||||
| Area of undeveloped land parcels owned (in acres) | 492.1 | ||||||||||||||||