(a) Amount represents our 20% ownership interest in the unconsolidated joint venture.

(b) Funds from operations, or FFO, is a widely recognized measure of REIT performance. We calculate FFO in accordance with the White Paper on FFO approved by the Board of Governors of the National Association of Real Estate Investment Trusts, or NAREIT. The White Paper defines FFO as net income or loss (as computed in accordance with U.S. generally accepted accounting principles, or GAAP), excluding extraordinary items (as defined by GAAP), gains from disposition of depreciable real estate and impairment writedowns of depreciable real estate, plus real estate-related depreciation and amortization (including capitalized leasing costs and tenant allowances or improvements). Adjustments for the unconsolidated joint venture are calculated to reflect FFO on the same basis.

The amounts shown in the table above will not agree to those previously reported for the three and nine months ended September 30, 2011 due to recent clarifications by the Securities and Exchange Commission regarding NAREIT’s definition of FFO. In response to those clarifications, we have amended our calculation of FFO to exclude impairment writedowns of depreciable real estate from all periods presented.

Management uses FFO as a supplemental performance measure because, in excluding real estate-related depreciation and amortization, impairment writedowns of depreciable real estate and gains from disposition of depreciable real estate, it provides a performance measure that, when compared year over year, captures trends in occupancy rates, rental rates and operating costs. We also believe that, as a widely recognized measure of the performance of REITs, FFO will be used by investors as a basis to compare our operating performance with that of other REITs.

However, because FFO excludes depreciation and amortization and captures neither the changes in the value of our properties that result from use or market conditions nor the level of capital expenditures and leasing commissions necessary to maintain the operating performance of our properties, all of which have real economic effect and could materially impact our results of operations, the utility of FFO as a measure of our performance is limited. Other Equity REITs may not calculate FFO in accordance with the NAREIT White Paper and, accordingly, our FFO may not be comparable to such other Equity REITs’ FFO. As a result, FFO should be considered only as a supplement to net income or loss as a measure of our performance. FFO should not be used as a measure of our liquidity, nor is it indicative of funds available to meet our cash needs, including our ability to pay dividends or make distributions. FFO also should not be used as a supplement to or substitute for cash flow from operating activities (as computed in accordance with GAAP).

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