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- Definition

Area of land held.

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- Definition

Number of shares of equity interests issued or issuable to acquire entity.

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- Definition

Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

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- Definition

The number of real estate properties owned as of the balance sheet date.

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- Definition

Cash received for the sale of real estate that is not part of an investing activity during the current period.

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- Definition

Carrying value as of the balance sheet date, including the current and noncurrent portions, of collateralized debt obligations (with maturities initially due after one year or beyond the operating cycle, if longer). Such obligations include mortgage loans, chattel loans, and any other borrowings secured by assets of the borrower.

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Investment in Office and Parking Properties - Summary of 2013 Acquisitions (Details) (USD $)	12 Months Ended	0 Months Ended						1 Months Ended	0 Months Ended		1 Months Ended
	Dec. 31, 2014 Property	Dec. 19, 2013	Jan. 17, 2013	Dec. 31, 2014	Dec. 30, 2014	Mar. 07, 2013 Property	Dec. 06, 2013	Dec. 31, 2013	Aug. 28, 2013 acre	Aug. 22, 2013	Aug. 19, 2013 acre
Business Acquisition [Line Items]
Total Purchase Price	$ 862,475,000
Number of real estate properties	51us-gaap_NumberOfRealEstateProperties			51us-gaap_NumberOfRealEstateProperties
Mortgage notes payable	1,339,450,000us-gaap_SecuredDebt			1,339,450,000us-gaap_SecuredDebt				1,097,493,000us-gaap_SecuredDebt
Thomas Properties Group, Inc.
Business Acquisition [Line Items]
Total Purchase Price		1,245,969,000
Office Building
Business Acquisition [Line Items]
Number of real estate properties	49			49
GEORGIA \| Office Building \| 3348 Peachtree, formerly Tower Place 200
Business Acquisition [Line Items]
Total Purchase Price			56,300,000
FLORIDA \| Land
Business Acquisition [Line Items]
Total Purchase Price				4,800,000	4,700,000
FLORIDA \| Office Building \| Deerwood North and South
Business Acquisition [Line Items]
Total Purchase Price						130,000,000
Number of real estate properties						2
Mortgage notes payable						84,500,000
Interest rate on mortgage (in percent)						3.90%
FLORIDA \| Office Building \| Lincoln Place
Business Acquisition [Line Items]
Number of common units issued in a business acquisition							900,000	900,000
ARIZONA \| Land Available for Development \| Land
Business Acquisition [Line Items]
Total Purchase Price									1,200,000
Area of land									1
Mortgages \| FLORIDA \| Office Building \| Lincoln Place
Business Acquisition [Line Items]
Mortgage notes payable							48,700,000	49,300,000
Interest rate on mortgage (in percent)							5.90%
Management \| FLORIDA \| Land Available for Development \| Land
Business Acquisition [Line Items]
Total Purchase Price											2,900,000
Area of land											6
Number of common units issued in a business acquisition										5,983
Total Wholly Owned \| Thomas Properties Group, Inc.
Business Acquisition [Line Items]
Number of real estate properties		2
Total Fund II \| Thomas Properties Group, Inc.
Business Acquisition [Line Items]
Number of real estate properties		5
Commerce Square \| PENNSYLVANIA \| Office Building
Business Acquisition [Line Items]
Number of real estate properties		2
Proceeds from sale of real estate		71,800,000
Four Points Centre \| TEXAS \| Office Building
Business Acquisition [Line Items]
Number of real estate properties		2
Proceeds from sale of real estate		21,700,000
Asset disposal gross sale price		$ 47,300,000