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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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- Definition

Long-lived assets that are held for sale apart from normal operations and anticipated to be sold in less than one year.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 157

-Paragraph 33

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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- Definition

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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- Definition

Fair value as of the balance sheet date of the assets less the liabilities of a derivative or group of derivatives.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 15

-URI http://asc.fasb.org/extlink&oid=6947722&loc=d3e13495-108611

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-Name Accounting Standards Codification

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-Publisher FASB

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 133

-Paragraph 17

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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Represents properties which were acquired directly or through foreclosure for which a committed plan to sell exists and an active program to market such properties has been initiated.

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 144

-Paragraph 33, 47

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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-Publisher FASB

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-SubTopic 20

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Amount of unrealized gain (loss) related to the increase or decrease in fair value of interest rate derivatives designated as cash flow hedging instruments, which was recorded in accumulated other comprehensive income to the extent that the cash flow hedge was determined to be effective.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 133

-Paragraph 46

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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Fair Value of Assets and Liabilities (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010	Dec. 31, 2010
Non-recurring Fair Value Measurements
Loss on asset impairment	$ 9,247		$ 9,247
Carrying value of properties	43,573		43,573		114,426
Interest rate swap agreements qualifying as cash flow hedges used for hedging mortgage note payable	175,000		175,000
Decrease in fair value of interest rate cash flow hedges	6,577	5,150	8,651	15,965
Fair value of derivative instruments included in accounts payable and accrued expenses and cumulative other comprehensive (loss) income	(15,607)		(15,607)		(6,956)
Recurring \| Total Fair value
Recurring Fair Value Measurements:
Effective portion of interest rate contracts	(15,607)		(15,607)
Recurring \| Fair Value at Reporting Date Using Significant Other Observable Inputs (Level 2)
Recurring Fair Value Measurements:
Effective portion of interest rate contracts	(15,607)		(15,607)
Nonrecurring \| Total Fair value
Non-recurring Fair Value Measurements
Properties held for sale	33,033		33,033
Nonrecurring \| Fair Value at Reporting Date Using Significant Other Observable Inputs (Level 2)
Non-recurring Fair Value Measurements
Properties held for sale	24,813		24,813
Nonrecurring \| Fair Value at Reporting Date Using Significant Unobservable Inputs (Level 3)
Non-recurring Fair Value Measurements
Properties held for sale	8,220		8,220
Fair Value at Reporting Date Using Quoted Prices in Active Markets for Identical Assets (Level 1) \| Office, industrial and other properties
Non-recurring Fair Value Measurements
Properties expected to sell within one year	16		16
Fair Value at Reporting Date Using Significant Other Observable Inputs (Level 2) \| Office, industrial and other properties
Non-recurring Fair Value Measurements
Properties expected to sell within one year	8		8
Fair Value at Reporting Date Using Significant Unobservable Inputs (Level 3) \| Office, industrial and other properties
Non-recurring Fair Value Measurements
Properties expected to sell within one year	2		2
Interest Rate Swap
Non-recurring Fair Value Measurements
Interest rate swap agreements qualifying as cash flow hedges used for hedging mortgage note payable	175,000		175,000
Derivative, variable rate basis			LIBOR
Office, industrial and other properties
Non-recurring Fair Value Measurements
Carrying value of properties	$ 42,280		$ 42,280
Office
Non-recurring Fair Value Measurements
Properties expected to sell within one year	6		6
Industrial & Other
Non-recurring Fair Value Measurements
Properties expected to sell within one year	20		20