This element represents the carrying value of a short-term real estate loan to finance building costs. The funds are disbursed as needed or in accordance with a prearranged plan; generally, a portion of the funds is disbursed at inception and the remainder as construction progresses. The money is repaid on completion of the project, usually from the proceeds of a mortgage loan. The rate is normally higher than the prime rate, and there is usually an origination fee. The effective yield on these loans tends to be high, and the lender has a security interest in the real property. Note that there are separate concepts for the current and noncurrent portions of long-term construction loans.

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Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date before deducting unamortized discount or premiums (if any). May include notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, which had initial maturities beyond one year or beyond the normal operating cycle, if longer.

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- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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Secured and unsecured senior debt Narratives (Details) (USD $)	3 Months Ended			0 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014 Greater Boston market Equity Method Investee	Jan. 31, 2014 Alexandria Technology Square Secured Debt from Insurance Company Maturing on 1 April 2014	Mar. 31, 2014 Construction Loans	Mar. 31, 2014 Construction Loans Greater Boston market Equity Method Investee
Debt Instrument [Line Items]
Outstanding Loan Balance				$ 208,700,000	$ 97,044,000
Contributions by noncontrolling interests	19,410,000	0		20,900,000
Equity interest percentage (in percent)			27.50%
Total Aggregate Commitments						213,200,000
Drawn and outstanding construction loan						$ 107,000,000