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Description of Business and Significant Accounting Policies (Details) (USD $) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2011 | Sep. 30, 2010 | Sep. 30, 2011 | Sep. 30, 2010 | Dec. 31, 2010
Description of Business and Significant Accounting Policies [Abstract] |  |  |  |  |
In-service office, industrial and retail properties (in units) | 302 |  | 302 |  |
Square footage of commercial property (in sq feet) | 29,200,000 |  | 29,200,000 |  |
Rental residential units (in units) | 96 |  | 96 |  |
Residential condominiums for sale (in units) | 18 |  | 18 |  |
Undeveloped land suitable for future development (in acres) | 601 |  | 601 |  |
Undeveloped land considered core holdings (in acres) | 523 |  | 523 |  |
Office properties completed but not yet stabilized | 1 |  | 1 |  |
Percentage of ownership of Common Units | 95.10% |  | 95.10% |  |
Common Units of partnership owned by The Company | 72,200,000 |  | 72,200,000 |  |
Common Units of partnership not owned by the Company | 3,800,000 |  | 3,800,000 |  |
Common Stock par value | $ 0.01 |  | $ 0.01 |  | $ 0.01
Number of officers of the Company who are also limited partners | 1 |  | 1 |  |
Number of directors of the Company who are also limited partners | 2 |  | 2 |  |
Common units redeemed for a like number of common shares of stock (in shares) |  |  | 43,308 |  |
Number of trading days preceeding Redemption Notice Date | 10 |  | 10 |  |
Number of Common Stock Sold During Period (in shares) | 142,000 |  |  |  |
Average Price of Common Stock Sold During Period | $ 34.21 |  |  |  |
Net Proceeds of Common Stock Sold During Period | $ 4,800,000 |  |  |  |
Excess of Preferred Stock redemption/repurchase cost over carrying value | $ 0 | $ 0 | $ 1,895,000 | $ 0 |
Number of common units required to convert to one share of common stock (in shares) | 1 |  | 1 |  |

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- Definition Area of undeveloped land parcels owned in acres. + Details
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- Definition Area of undeveloped land parcels owned in acres, considered core holdings. + Details
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- Definition The average price of Common Stock sold "at the market" during the period. + Details
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- Definition The number of units not held by the Company. + Details
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- Definition The number of units held by the Company. + Details
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- Definition The percentage of units held by the Company. + Details
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- Definition The net proceeds of Common Stock sold "at the market" during the period. + Details
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- Definition The number of Common Stock sold "at the market" during the period. + Details
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- Definition The number of real estate properties, completed but not yet stabilized as of the balance sheet date. We consider a development project to be stabilized upon the earlier of the original projected stabilization date or the date such project is at least 95% occupied. + Details
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- Definition The number of directors who are also limited partners of the Operating Partnership + Details
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- Definition The number of officers who are also limited partners of the Operating Partnership. + Details
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- Definition The number of 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. + Details
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- Definition Number of trading days immediately preceeding the redemption notice date used to calculate value. + Details
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- Definition Face amount or stated value of common stock per share; generally not indicative of the fair market value per share. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 30 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 4 -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. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The number of shares converted in a noncash (or part noncash) transaction. Noncash is defined as transactions during a period that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4332-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 32 -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. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4313-108586 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586 + Details
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- Definition The excess of (1) fair value of the consideration transferred to the holders of the preferred stock over (2) the carrying amount of the preferred stock in the registrant's balance sheet, during the accounting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number D-42 -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. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section S99 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6802175&loc=d3e42851-122695 + Details
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