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Real Estate Investments (Details Textuals) (USD $)	Jun. 30, 2011	Mar. 28, 2011 Overlook I And II [Member] sqft	Jan. 20, 2011 Parcel of land in PA [Member]	Jan. 20, 2011 Parcel of land in PA [Member] Partnership Interest [Member]	Aug. 05, 2010 Three Logan Square [Member] sqft	Aug. 05, 2010 Three Logan Square [Member] Partnership Interest [Member]
Real Estate Investments (Textuals)
Net rentable space of property acquired		126,496			1,000,000
Recognized tenant and other receivables from acquisition					$ 1,100,000
Prepaid real estate taxes from acquisition					1,500,000
Advance under credit facility		600,000,000
Acquisition related costs			500,000		400,000
Number of storey of office tower acquired					53
Business Acquisition, Equity Interest Issued or Issuable, Description				50% limited interest in the partnership
Business Acquisition, consideration received			4,900,000
Business Acquisition, Equity Interest Issued or Issuable, Number of Units						7,111,112
Lease percentage of acquired property		100.00%			67.20%
Acquisitions through cash					51,200,000
Assumed security deposits obligations	700,000				900,000
Closing market price of Parent Company's common shares on acquisition date					11.54
Annual dividend rate per share					$ 0.60
Net amount of cash paid after assumed liabilities					50,300,000
Acquired real estate, cost of property		$ 12,600,000	$ 9,300,000		$ 129,000,000

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Additional real estate investments.

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Business Acquisition Consideration Received.

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Business Acquisition Cost Of Acquired Entity Cash Paid Net Amount.

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Business Acquisition Equity Interest Issued Or Issuable Number Of Units Issued.

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Business Acquisitions Equity Interest Issued Or Issuable Description.

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Closing market price Parent Company's common shares on acquisition date.

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Lease percentage of acquired property.

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Net Rentable Space.

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Number of storey of office tower acquired.

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Prepaid Real Estate Taxes From Acquisition.

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Amount of cash paid to acquire the entity.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 141R
-Paragraph 68
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
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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.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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The total cost of the acquired entity including the cash paid to shareholders of acquired entities, fair value of debt and equity securities issued to shareholders of acquired entities, the fair value of the liabilities assumed, and direct costs of the acquisition.

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Amount of direct costs of the business combination including legal, accounting, and other costs incurred to consummate the business acquisition.

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For receivables acquired in a business combination, excluding certain loans and debt securities acquired in a transfer (as defined), this element represents the gross contractual amounts receivable, by major class of receivable, such as loans, direct finance leases (as defined), and any other class of receivables.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Statement of Position (SOP)
-Number 03-3
-Paragraph 3
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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The per share amount of a dividend declared, but not paid, as of the financial reporting date.

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Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 19, 22
-Article 5

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