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Commitments and Contingencies (Details Textuals) (USD $)	6 Months Ended
	Jun. 30, 2011 sqft	Aug. 05, 2010
Commitments and Contingencies (Textuals) [Abstract]
Minimum remaining lease period	18
Maximum remaining lease period	92
Annual rental payment under ground lease	ten dollars through August 2022. The annual rental payment after 2022 will be adjusted at the lower of $3.0 million or the prevailing market rent at that time until 2030. Subsequent to 2030, the annual rental payment will be adjusted at the lower of $4.0 million or the prevailing market rent at the time until 2042 and at fair market value until 2091.
Aggregate fair market rent future payment as of the date of acquisition		$ 27,400,000
Area of Two Logan Square in Philadelphia	708,844
If the Company takes fee title to Two Logan Square upon a foreclosure of its mortgage, the Company has agreed to pay an unaffiliated third party that holds a residual interest in the fee owner of this property	2,900,000
Liability related to acquisition of TRC	700,000
Accretion Of Liability Related To Acquisition	2,900,000
Balance portion of acquisition related liability	$ 1,300,000
Company agreed not to sell acquired properties up to the period	15 years

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Accretion Of Liability Related To Acquisition

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- Definition

Balance portion of acquisition related liability.

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Commitments And Contingencies.

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Company agreed not to sell acquired properties up to the period.

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- Definition

If the Company takes fee title to Two Logan Square upon a foreclosure of its mortgage, the Company has agreed to pay an unaffiliated third party that holds a residual interest in the fee owner of this property.

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- Definition

Leased area of building.

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Balance Type:	na
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- Definition

Maximum remaining lease period.

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- Definition

Minimum remaining lease period.

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- Definition

Fair Value of the liabilities incurred by the acquirer to former owners of the acquiree, including the fair value of any contingent consideration. If liabilities transferred as consideration remain within the combined entity after the business combination (for example, because the assets or liabilities were transferred to the acquiree rather than to its former owners), and the acquirer therefore retains control of them; in that situation, the acquirer shall measure those liabilities at their carrying amounts immediately before the acquisition date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 141
-Paragraph 51
-Subparagraph d

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 141R
-Paragraph 39, 40, 41

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 141R
-Paragraph 68
-Subparagraph f(3)

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- Definition

The total of contractually required rental payments on leases meeting the criteria for capitalization.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 13
-Paragraph 16
-Subparagraph a(ii)

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- Definition

This element represents a description of the nature and extent of capital lease arrangements between related parties.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 13
-Paragraph 29

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