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Represents information pertaining to exit capitalization rate used as an input to measure fair value.

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The number of held for sale properties owned by the entity and expected to be sold within one year from the balance sheet date.

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The number of long-lived held and used properties impaired and written down from their carrying value to fair value during the period.

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Amount of the hedged item as of the balance sheet date related to the derivative. For example, the hedged balance on a debt instrument.

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The reference rate for the variable rate of the interest rate derivative, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR.

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The effective portion of loss reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments.

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The effective portion of losses on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period.

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Provision recognizing a loss (after tax benefit) for initial, or subsequent, write-down to fair value (less cost to sell) of a disposal group that is classified as a component of the entity, which remains unsold as of the reporting date. May include the recognition of a (gain) (net of tax expense) for a subsequent increase in fair value (less cost to sell), but not in excess of the cumulative loss previously recognized through write-downs.

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Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt.

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The estimated net amount of unrealized gains or losses on interest rate cash flow hedges as of the balance sheet date expected to be reclassified to earnings within the next twelve months.

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Fair value as of the balance sheet date of all interest rate derivative liabilities designated as cash flow hedging instruments.

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The loss recognized for any initial write-down from carrying value to fair value less cost to sell for a classified as held for sale.

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Net of tax amount, before reclassification adjustments, of the change in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Also includes an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

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Amount of real estate investment property, net of accumulated depreciation, which may include the following: (1) land available-for-sale; (2) land available-for-development; (3) investments in building and building improvements; (4) tenant allowances; (5) developments in-process; (6) rental properties; and (7) other real estate investments.

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Fair Value of Assets and Liabilities (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Nonrecurring Fair Value Measurements:
Properties held for sale	$ 6,821,803	$ 6,310,062
Impairment charge	168,632	7,319	99,315
Effects of interest rate derivatives on our consolidated statements of operations and consolidated statements of comprehensive income (loss)
Unrealized loss on derivative instruments	(828)	(8,840)	(9,501)
Minimum
Valuation techniques and significant unobservable inputs
Discount rate (as a percent)	9.00%
Exit capitalization rate (as a percent)	8.00%
Market rent growth rate (as a percent)	2.00%
Maximum
Valuation techniques and significant unobservable inputs
Discount rate (as a percent)	15.00%
Exit capitalization rate (as a percent)	10.00%
Market rent growth rate (as a percent)	3.00%
Interest Rate Swap
Recurring Fair Value Measurements:
Interest rate swap agreements qualifying as cash flow hedges used for hedging mortgage note payable	175,000
Derivative, variable rate basis	LIBOR
Interest Rate Swap \| Cash Flow Hedges
Recurring Fair Value Measurements:
Effective portion of interest rate contracts	(16,624)	(15,796)	(6,956)
Effects of interest rate derivatives on our consolidated statements of operations and consolidated statements of comprehensive income (loss)
Balance at beginning of year	(15,796)	(6,956)	2,545
Amount of loss recognized in accumulated other comprehensive income	(5,790)	(13,804)	(14,408)
Amount of loss reclassified from cumulative other comprehensive income into interest expense	4,962	4,964	4,907
Unrealized loss on derivative instruments	(828)	(8,840)	(9,501)
Balance at end of year	(16,624)	(15,796)	(6,956)
Reclassification from cumulative other comprehensive income (loss) into interest expense, over the next 12 months	4,886
Nonrecurring
Nonrecurring Fair Value Measurements:
Impairment charge	168,632
Nonrecurring \| CBD Office
Nonrecurring Fair Value Measurements:
Properties held for sale	2,952,995	2,447,541
Loss on asset impairment	2,452
Properties held for sale	1
Nonrecurring \| Suburban Office
Nonrecurring Fair Value Measurements:
Properties held for sale	2,552,884	2,541,616
Loss on asset impairment	129,802
Properties held for sale	31
Nonrecurring \| Office
Nonrecurring Fair Value Measurements:
Number of properties held for sale impaired	32
Nonrecurring \| Industrial and Other
Nonrecurring Fair Value Measurements:
Properties held for sale	1,315,924	1,320,905
Loss on asset impairment	36,378
Properties held for sale	26
Nonrecurring \| Industrial
Nonrecurring Fair Value Measurements:
Number of properties held for sale impaired	26
Nonrecurring \| Carrying Amount
Nonrecurring Fair Value Measurements:
Properties held for sale	298,106
Nonrecurring \| Total Fair value
Recurring Fair Value Measurements:
Effective portion of interest rate contracts	(16,624)
Nonrecurring Fair Value Measurements:
Properties held for sale	129,474
Effects of interest rate derivatives on our consolidated statements of operations and consolidated statements of comprehensive income (loss)
Balance at end of year	(16,624)
Nonrecurring \| Fair Value at Reporting Date Using Significant Other Observable Inputs (Level 2)
Recurring Fair Value Measurements:
Effective portion of interest rate contracts	(16,624)
Effects of interest rate derivatives on our consolidated statements of operations and consolidated statements of comprehensive income (loss)
Balance at end of year	(16,624)
Nonrecurring \| Fair Value at Reporting Date Using Significant Unobservable Inputs (Level 3)
Nonrecurring Fair Value Measurements:
Properties held for sale	$ 129,474
Number of properties held for sale impaired	58