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Subsequent events (Notes)	12 Months Ended
Subsequent events (Notes)	Dec. 31, 2013
Subsequent Events [Abstract]
Subsequent events	Subsequent events Acquisition of 3545 Cray Court On January 30, 2014, we acquired 3545 Cray Court, a 116,556 RSF laboratory/office property located in the Torrey Pines submarket of San Diego, for $64.0 million. The property is currently 100% occupied by The Scripps Research Institute. The estimated initial stabilized yields for this property are 7.0% and 7.2%, on a cash and GAAP basis, respectively. In connection with the acquisition, we assumed a $40.7 million non-recourse secured note payable with a contractual interest rate of 4.66% and a maturity date of January 2023. Repayment of secured note payable On January 31, 2014, we repaid our $208.7 million secured note payable related to Alexandria Technology Square^®. Our joint venture partner funded $20.9 million of the proceeds required to repay the secured note payable.