Subsequent Events (Details) (USD $)		1 Months Ended
Jun. 30, 2011	Jul. 31, 2012 Acquisition Scottsdale Healthcare item	Jul. 31, 2012 Acquisition Boyer Company item
Subsequent Events
Number of medical office buildings acquired		8	12
Acquisition of MOBs		$ 81,000,000	$ 179,000,000
Consideration, DownREIT Units			41,000,000
Debt Acquired	$ 48,252,000		$ 59,000,000

The acquisition-date fair value of the equity interests of the acquirer, including the number of instruments or interests issued or issuable in consideration for the business combination.

+ References+ Details

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 measures those liabilities at their carrying amounts immediately before the acquisition date.

+ References

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

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Reference 6: http://www.xbrl.org/2003/role/presentationRef

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+ Details