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The number of real estate properties, by acquisition, product type, or geographic location, acquired during the reporting period.

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The number of real estate properties, by sale, product type, or geographic location, sold during the reporting period.

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Net proceeds from building sales to unconsolidated joint ventures

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Properties For Which Acquistion Accounting is Preliminary

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Square Footage Of Real Estate Properties Acquired Or Disposed.

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The calculated weighted-average amortization period of a major class of finite-lived intangible assets acquired during the current period either individually or as part of a group of assets (in either an asset acquisition or business combination). A major class is composed of intangible assets that can be grouped together because they are similar, either by their nature or by their use in the operations of a company.

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Amount of cash paid to acquire the entity.

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The number of limited partner units issued.

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Increase in noncontrolling interest balance because of a business combination that occurred during the period.

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The cash inflow from sale of buildings.

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

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Acquisitions and Dispositions (Narrative) (Details) (USD $) Share data in Millions, unless otherwise specified	9 Months Ended															9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011 Raleigh North Carolina [Member] Other 2011 Acquisitions [Member] Industrial Buildings [Member] buildings	Sep. 30, 2011 Raleigh North Carolina [Member] Other 2011 Acquisitions [Member] Office [Member] buildings	Sep. 30, 2011 Chicago Illinois [Member] Other 2011 Acquisitions [Member] Industrial Buildings [Member] buildings	Sep. 30, 2011 Dallas Texas [Member] Other 2011 Acquisitions [Member] Industrial Buildings [Member] buildings	Sep. 30, 2011 Southern California [Member] Other 2011 Acquisitions [Member] Industrial Buildings [Member] buildings	Sep. 30, 2011 Phoenix Arizona [Member] Other 2011 Acquisitions [Member] Industrial Buildings [Member] buildings	Sep. 30, 2011 Savannah Georgia [Member] Other 2011 Acquisitions [Member] Industrial Buildings [Member] buildings	Sep. 30, 2011 Indianapolis Indiana [Member] Other 2011 Acquisitions [Member] Office [Member] buildings	Sep. 30, 2011 Atlanta Georgia [Member] Other 2011 Acquisitions [Member] Office [Member] buildings	Sep. 30, 2011 Premier Portfolio [Member] Industrial Buildings [Member] buildings	Dec. 31, 2010 Premier Portfolio [Member] Industrial Buildings [Member] buildings	Sep. 30, 2011 Premier Portfolio [Member] Office [Member] buildings	Dec. 31, 2010 Premier Portfolio [Member] Office [Member] buildings	Sep. 30, 2011 Suburban Office Properties [Member] sqft buildings	Sep. 30, 2011 Premier Portfolio [Member] years buildings	Sep. 30, 2011 Other 2011 Acquisitions [Member] years buildings
Cash consideration paid for acquisition																	$ 27,400,000
Number of real estate properties acquired			5	1	2	1	1	1	1	1	1	12	38	4	1		55	14
Square footage of real estate property																2,000,000
Face value of assumed debt																	124,400,000
Unit issuance to the sellers																	2.1
Unit issuance to the sellers, fair value																	28,400,000
Weighted average remaining life of property (years)																	3.5	6.8
Proceeds from land and depreciated property sales, net	504,688,000	200,445,000
Number of real estate properties sold																13
Percentage retained ownership in property dispostion	20.00%
Proceeds from sale of buildings																342,800,000
Net proceeds from building sales to unconsolidated joint ventures																$ 273,700,000
Properties for which acquistion accounting is preliminary																		7