Commitments and Contingencies	3 Months Ended
Mar. 31, 2016
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies (a) Contingent liabilities As part of the acquisition of 29A International Business Park, the seller could earn additional consideration based on future net operating income growth in excess of certain performance targets, as defined in the agreements for the acquisition. The earnout contingency expires in November 2020. The maximum amount that could be earned by the seller is $50.0 million SGD (or approximately $37.1 million based on the exchange rate as of March 31, 2016). As of December 31, 2014, $12.6 million had been accrued related to this earnout agreement, which was subsequently paid in 2015. During 2015, the remaining performance targets were achieved and the Company accrued an additional $19.4 million. The remaining earnout payments will be made in 2016 and 2020 per the terms of the earnout agreement. The amounts accrued have been discounted based on their expected payment date and capitalized to building and improvements as the original purchase was accounted for as an asset acquisition. One of the tenants at our Convergence Business Park property has an option to expand as part of their lease agreement, which expires in April 2017. As part of this option, development activities were not permitted on specifically identified expansion space within the property until April 2014. From April 2014 through April 2017, the tenant has the right of first refusal on any third party’s bona fide offer to buy the adjacent land. If the tenant exercises their option, we may either construct and lease to the tenant an additional shell building on the expansion space at a stipulated rate of return on cost or sell the existing building and the expansion space to the tenant for a price of approximately $24.0 million and $225,000 per square acre, respectively, plus additional adjustments as provided in the lease. As part of the acquisition of the Sentrum Portfolio, the seller could earn additional consideration based on future net returns on vacant space to be developed, but not currently leased, as defined in the purchase agreement for the acquisition. The initial estimate of fair value of the contingent consideration liability was approximately £56.5 million (or approximately $87.6 million based on the exchange rate as of July 11, 2012, the acquisition date). We have adjusted the contingent consideration to fair value at each reporting date with changes in fair value recognized in operating income. During the three months ended March 31, 2015, we reduced the fair value by approximately £30.3 million (or approximately $45.9 million). The adjustment was the result of an evaluation by management that no additional leases would be executed for vacant space by July 11, 2015, the contingency expiration date. The final payment on the earnout was made in August 2015. The change in fair value of contingent consideration for Sentrum was recorded as a reduction to operating expense of approximately $43.0 million for the three months ended March 31, 2015. (b) Construction Commitments Our properties require periodic investments of capital for tenant-related capital expenditures and for general capital improvements. From time to time in the normal course of our business, we enter into various construction contracts with third parties that may obligate us to make payments. At March 31, 2016, we had open commitments related to construction contracts of approximately $209.9 million. (c) Legal Proceedings Although the Company is involved in legal proceedings arising in the ordinary course of business, as of March 31, 2016, the Company is not currently a party to any legal proceedings nor, to its knowledge, is any legal proceeding threatened against it that it believes would have a material adverse effect on its financial position, results of operations or liquidity.

Commitments and Contingencies

(a) Contingent liabilities

As part of the acquisition of 29A International Business Park, the seller could earn additional consideration based on future net operating income growth in excess of certain performance targets, as defined in the agreements for the acquisition. The earnout contingency expires in November 2020. The maximum amount that could be earned by the seller is $50.0 million SGD (or approximately $37.1 million based on the exchange rate as of March 31, 2016). As of December 31, 2014, $12.6 million had been accrued related to this earnout agreement, which was subsequently paid in 2015. During 2015, the remaining performance targets were achieved and the Company accrued an additional $19.4 million. The remaining earnout payments will be made in 2016 and 2020 per the terms of the earnout agreement. The amounts accrued have been discounted based on their expected payment date and capitalized to building and improvements as the original purchase was accounted for as an asset acquisition.

One of the tenants at our Convergence Business Park property has an option to expand as part of their lease agreement, which expires in April 2017. As part of this option, development activities were not permitted on specifically identified expansion space within the property until April 2014. From April 2014 through April 2017, the tenant has the right of first refusal on any third party’s bona fide offer to buy the adjacent land. If the tenant exercises their option, we may either construct and lease to the tenant an additional shell building on the expansion space at a stipulated rate of return on cost or sell the existing building and the expansion space to the tenant for a price of approximately $24.0 million and $225,000 per square acre, respectively, plus additional adjustments as provided in the lease.

As part of the acquisition of the Sentrum Portfolio, the seller could earn additional consideration based on future net returns on vacant space to be developed, but not currently leased, as defined in the purchase agreement for the acquisition. The initial estimate of fair value of the contingent consideration liability was approximately £56.5 million (or approximately $87.6 million based on the exchange rate as of July 11, 2012, the acquisition date). We have adjusted the contingent consideration to fair value at each reporting date with changes in fair value recognized in operating income. During the three months ended March 31, 2015, we reduced the fair value by approximately £30.3 million (or approximately $45.9 million). The adjustment was the result of an evaluation by management that no additional leases would be executed for vacant space by July 11, 2015, the contingency expiration date. The final payment on the earnout was made in August 2015. The change in fair value of contingent consideration for Sentrum was recorded as a reduction to operating expense of approximately $43.0 million for the three months ended March 31, 2015.

(b) Construction Commitments

Our properties require periodic investments of capital for tenant-related capital expenditures and for general capital improvements. From time to time in the normal course of our business, we enter into various construction contracts with third parties that may obligate us to make payments. At March 31, 2016, we had open commitments related to construction contracts of approximately $209.9 million.

Although the Company is involved in legal proceedings arising in the ordinary course of business, as of March 31, 2016, the Company is not currently a party to any legal proceedings nor, to its knowledge, is any legal proceeding threatened against it that it believes would have a material adverse effect on its financial position, results of operations or liquidity.