al tenant or retenanted space), the involvement of external leasing agents and overall competitive mar- ket conditions.  As of December 31, 2004 and 2003, approximately 83% and 88%, respectively, of our leases (on a square footage basis) were triple net leases, requiring tenants to pay substantially all real estate taxes and insur- ance, common area and other operating expenses, including increases thereto.The decrease in triple net leases from 2003 to 2004 is primarily due to gross leases added to the portfolio from properties acquired in 2004. Gross leases are generally converted to triple net leases upon renewal or rollover. In addition, as of December 31, 2004, approximately 7% of our leases (on a square footage basis) required the ten- ants to pay a majority of operating expenses.Approximately 89% of our leases (on a square footage basis) contained effective annual rent escalations that are either fixed (generally ranging from 3% to 3.5%) or indexed based on the consumer price index or another index. Accordingly, we do not believe that our earnings or cash flow from real estate operations are subject to any significant risk from inflation. An increase in inflation, however, could result in an increase in the cost of our variable rate borrowings, including our unsecured line of credit and unsecured term loan.  GAAP basis accounting for real estate assets utilizes historical cost accounting and assumes real estate values diminish over time. In an effort to overcome the miscorrelation between real estate values and historical cost accounting for real estate assets, the Board of Governors of the National Association of Real Estate Investment Trusts (“NAREIT”) established the measurement tool of Funds From Operations (“FFO”). Since its introduction, FFO has become a widely used non-GAAP financial meas- ure by REITs.We believe that FFO is helpful to investors as an additional measure of the performance of an equity REIT. We compute FFO in accordance with standards established by the Board of Governors of NAREIT in its April 2002 White Paper (the “White Paper”) and related implementation guidance, which may differ from the methodology for calculating FFO utilized by other equity REITs, and, accordingly, may not be comparable to such other REITs. In 2003, NAREIT issued guidance which modifies the calculation of FFO for both past and future periods. In accordance with NAREIT’s revised guidance, we now include losses from early extinguishment of debt and real estate impairment charges in our calculation of FFO.As such, the reported amounts of FFO for the year ended December 31, 2002 have been modified from those previously reported. The White Paper defines FFO as net income (loss) (computed in accordance with GAAP), excluding gains (or losses) from sales, plus real estate related depreciation and amortization, and after adjustments for unconsolidated partnerships and joint ventures.While FFO is a relevant and widely used measure of operating performance for REITs, it should not be considered as an alternative to net income (determined in accordance with GAAP) as an indication of financial performance, or to cash flows from operating activities (determined in accor- dance with GAAP) as a measure of our liquidity, nor is it indicative of funds available to fund our cash needs, including our ability to make distributions. (See “Cash Flows” for information regarding these measures of cash flow.) We believe that net income is the most directly comparable GAAP financial measure to FFO.  F U N D S F R O M O P E R AT I O N S I N F L AT I O N P 15