13. ACQUISITIONS AND DISPOSITIONS The acquisition method of accounting is based on ASC Subtopic 805-10,  Business Combinations,  and uses the fair value concepts defined in ASC Subtopic 820-10,   Fair Value Measurements and Disclosures,   which the Company has adopted as required. The total purchase price is allocated to the net tangible and intangible assets based upon their fair values as of the acquisition dates. The excess of the purchase price over the fair values of the net tangible assets and intangible assets was recorded as goodwill. The allocation of the purchase price was based upon a valuation and is subject to change within the one-year measurement period following the acquisition. MSCI expects to continue to obtain information to assist it in determining the fair value of the net assets acquired at the acquisition date during the measurement period. Acquisition of IPD On November 30, 2012, MSCI Limited, an indirect wholly-owned subsidiary of the Company, paid cash of $124.8 million to acquire real estate performance measurement group IPD. The acquisition of IPD expands the Company s multi-asset class offering by facilitating the integration of private real estate assets into its models, as well as adding a family of real estate indices to the Company s family of equity indices. IPD is dedicated to the objective measurement of the commercial real estate market. Headquartered in London, with offices around the world, IPD is a leading provider of real estate performance analysis for funds, investors, managers, lenders and occupiers and offers a wide range of services that include research, reporting, benchmarking and indices. IPD has been added as a component of the Performance and Risk business segment. As of June 30, 2013, the preliminary purchase price allocations for the IPD acquisition were $76.5 million for goodwill, $58.7 million for identifiable intangible assets, $18.6 million for assets other than identifiable intangible assets and $29.0 million for other liabilities. Acquisition of InvestorF