Investments in Unconsolidated Joint Ventures	9 Months Ended
Sep. 30, 2011
Investments in Unconsolidated Joint Ventures [Abstract]
Investments in Unconsolidated Joint Ventures	7. Investments in Unconsolidated Joint Ventures During the six months ended June 30, 2010, we entered into a joint venture investment with Forest City Enterprises (NYSE:FCE.A and FCE.B). We acquired a 49% interest in a seven-building life science campus located in University Park in Cambridge, MA, which is immediately adjacent to the campus of the Massachusetts Institute of Technology. Six buildings closed on February 22, 2010 and the seventh closed on June 30, 2010. The portfolio is 100% leased. In connection with these transactions, we invested $174,692,000 of cash which is recorded as an equity investment on the balance sheet. Our share of the non-recourse secured debt assumed by the joint venture was approximately $156,729,000 with weighted-average interest rates of 7.1%. The aggregate remaining unamortized basis difference of our investment in this joint venture of $8,814,000 at September 30, 2011 is primarily attributable to real estate and related intangible assets and will be amortized over the life of the related properties and included in the reported amount of income from unconsolidated joint ventures. In December 2010, we entered into a strategic joint venture relationship with a national medical office building company. In connection with this transaction, we invested $21,321,000 of cash which is recorded as an equity investment on the balance sheet. Our share of the non-recourse secured debt assumed by the joint venture relationship was approximately $24,609,000 with weighted-average interest rates of 6.06%. During the first nine months of 2011, we invested an additional $729,000 and assumed our share of non-recourse secured debt of approximately $3,668,000 with a weighted average interest rate of 4.5% for completion of construction in two medical office buildings. The aggregate remaining unamortized basis difference of our investment in this joint venture of $70,000 at September 30, 2011 is primarily attributable to real estate and related intangible assets and will be amortized over the life of the related properties and included in the reported amount of income from unconsolidated joint ventures. In addition, in January 2011, we completed the formation of a partnership with Silverado Senior Living, Inc. See Note 3 for additional information. The results of operations for these investments have been included in our consolidated results of operations from the date of acquisition by the joint venture and are reflected in our income statement as income from unconsolidated joint ventures.

Investments in Unconsolidated Joint Ventures

9 Months Ended

Sep. 30, 2011

Investments in Unconsolidated Joint Ventures [Abstract]

Investments in Unconsolidated Joint Ventures

7. Investments in Unconsolidated Joint Ventures

During the six months ended June 30, 2010, we entered into a joint venture investment with Forest City Enterprises (NYSE:FCE.A and FCE.B). We acquired a 49% interest in a seven-building life science campus located in University Park in Cambridge, MA, which is immediately adjacent to the campus of the Massachusetts Institute of Technology. Six buildings closed on February 22, 2010 and the seventh closed on June 30, 2010. The portfolio is 100% leased. In connection with these transactions, we invested $174,692,000 of cash which is recorded as an equity investment on the balance sheet. Our share of the non-recourse secured debt assumed by the joint venture was approximately $156,729,000 with weighted-average interest rates of 7.1%. The aggregate remaining unamortized basis difference of our investment in this joint venture of $8,814,000 at September 30, 2011 is primarily attributable to real estate and related intangible assets and will be amortized over the life of the related properties and included in the reported amount of income from unconsolidated joint ventures.

In December 2010, we entered into a strategic joint venture relationship with a national medical office building company. In connection with this transaction, we invested $21,321,000 of cash which is recorded as an equity investment on the balance sheet. Our share of the non-recourse secured debt assumed by the joint venture relationship was approximately $24,609,000 with weighted-average interest rates of 6.06%. During the first nine months of 2011, we invested an additional $729,000 and assumed our share of non-recourse secured debt of approximately $3,668,000 with a weighted average interest rate of 4.5% for completion of construction in two medical office buildings. The aggregate remaining unamortized basis difference of our investment in this joint venture of $70,000 at September 30, 2011 is primarily attributable to real estate and related intangible assets and will be amortized over the life of the related properties and included in the reported amount of income from unconsolidated joint ventures.

In addition, in January 2011, we completed the formation of a partnership with Silverado Senior Living, Inc. See Note 3 for additional information.

The results of operations for these investments have been included in our consolidated results of operations from the date of acquisition by the joint venture and are reflected in our income statement as income from unconsolidated joint ventures.