ROIC computes FFO in accordance with the "White Paper" on FFO published by NAREIT, which defines FFO as net income attributable to common shareholders (determined in accordance with GAAP) excluding gains or losses from debt restructuring and sales of property, plus real estate related depreciation and amortization, and after adjustments for partnerships and unconsolidated joint ventures. FFO as defined by ROIC may not be comparable to similarly titled items reported by other real estate investment trusts due to possible differences in the application of the NAREIT definition used by such REITs. In addition, ROIC calculates modified FFO, by adding acquisition transaction costs associated with business combinations which have been expensed in accordance with GAAP to FFO as defined above. For the three months ended March 31, 2012 and 2011, ROIC expensed $122,843 and $175,115, respectively relating to real estate acquisitions.