non-cash depreciation or the cost of debt. However, because EBITDAre and adjusted EBITDA are calculated before recurring cash charges including interest expense and taxes, and are not adjusted for capital expenditures or other recurring cash requirements of our business, their utilization as a cash flow measurement is limited.
Funds From Operations (“FFO”) is a supplemental measure of our performance which should be considered
along with, but not as an alternative to, net income and cash provided by operating activities as a measure of operating performance. We calculate FFO in accordance with the standards established by Nareit. FFO represents net income (loss) (computed in accordance with GAAP), excluding gains (or losses) from sales of property and undepreciated land and impairment write-downs of depreciable real estate, plus real estate related depreciation and amortization (excluding amortization of deferred financing costs) and after adjustments for unconsolidated partnerships and joint ventures.
Our management uses FFO as a supplemental performance measure because, by excluding real estate related depreciation and amortization and gains and losses from property dispositions, it provides a performance measure that, when compared year over year, captures trends in occupancy rates, rental rates and operating costs.
We offer this measure because we recognize that investors use FFO as a basis to compare our operating performance with that of other REITs. However, the utility of FFO as a measure of our performance is limited 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 capitalized leasing commissions necessary to maintain the operating performance of our properties, all of which have real economic effect and could materially impact our financial condition and results from operations. FFO is a non-GAAP measure and should not be considered a measure of liquidity, an alternative to net income, cash provided by operating activities or any other performance measure determined in accordance with GAAP, nor is it indicative of funds available to fund our cash needs, including our ability to pay dividends or make distributions. In addition, our calculations of FFO are not necessarily comparable to FFO as calculated by other REITs that do not use the same definition or implementation guidelines or interpret the standards differently from us. Investors in our securities should not rely on these measures as a substitute for any GAAP measure, including net income.
GAAP Annualized Rent
Represents the monthly average contractual rent as stated on customer contracts, multiplied by 12. This amount is inclusive of any one-time or non-recurring rent abatements and excludes power revenue, interconnection revenue and operating expense reimbursement.
Monthly Recurring Revenue per Cabinet Equivalent Billed
Represents the turn-key monthly recurring colocation revenue (“MRR”) per cabinet equivalent billed. We define MRR as recurring contractual revenue, including rental, power, and interconnection revenue and operating expense reimbursement, under existing commenced customer leases. MRR per cabinet equivalent is calculated as (current quarter MRR/3) divided by ((quarter-end cabinet equivalents billed plus prior quarter-end cabinet equivalents billed)/2). Cabinet equivalents are calculated as cage-usable square feet (turn-key leased NRSF/NRSF factor) divided by 25.