transfer agent fees, fees paid to our board of directors, loan servicing expenses, administrative services expenses, and related costs associated with legal, regulatory compliance and investor relations, but excluding the following: (a) advisory fees, (b) interest expense and other financing costs, (c) taxes, (d) distribution or shareholder servicing fees and (e) unusual, unexpected and/or nonrecurring expenses. We will repay FS Real Estate Advisor or Rialto on a quarterly basis any ordinary operating expenses previously waived or paid, but only if the reimbursement would not cause the then-current expense limitation, if any, to be exceeded. In addition, the reimbursement of expenses will be made only if payable not more than three years from the end of the fiscal quarter in which the expenses were paid or waived.
FS Real Estate Advisor and Rialto each agreed to waive the recoupment of any amounts that may be subject to conditional reimbursement during the quarterly period ended September 30, 2022. To the extent that the conditions to recoupment are satisfied in a future quarter (prior to the expiration of the three-year period for reimbursement set forth in the expense limitation agreement), such expenses may be subject to conditional recoupment in accordance with the terms of the expense limitation agreement.
During the period from September 13, 2017 (Commencement of Operations) to September 30, 2022, we received $5,839 for reimbursement of expenses that FS Real Estate Advisor and Rialto paid or waived, including $0 in reimbursements for the nine months ended September 30, 2022. As of September 30, 2022, $3,486 of expense recoupments were paid or payable to FS Real Estate Advisor and Rialto and $2,353 of expense reimbursements were no longer eligible for recoupment.
During the nine months ended September 30, 2022, $2,832 of expense recoupments were paid to FS Real Estate Advisor and Rialto. As of September 30, 2022, $256 of expense recoupments were payable to FS Real Estate Advisor and Rialto.
Valuation of Mortgage Debt
Commercial real estate debt and mortgage-backed securities held-to-maturity are valued at amortized cost, consistent with how they are recorded in accordance with GAAP, as these instruments are intended to be held-to-maturity. Liabilities are valued at amortized cost as these obligations are expected to be satisfied at their carrying value. See Note 8 to our unaudited consolidated financial statements included herein for additional information regarding a comparison of our carrying value and an estimate of the fair value of our commercial real estate debt, mortgage-backed securities held-to-maturity, repurchase agreements payable, credit facility payable, and collateralized loan obligations.
Non-GAAP Financial Measures
Funds from Operations and Modified Funds from Operations
We use Funds from Operations, or FFO, a widely accepted non-GAAP financial metric, to evaluate our performance. FFO provides a supplemental measure to compare our performance and operations to other REITs. Due to certain unique operating characteristics of real estate companies, the National Association of Real Estate Investment Trusts, or NAREIT, has promulgated a standard known as FFO, which it believes more accurately reflects the operating performance of a REIT. As defined by NAREIT, FFO means net income computed in accordance with GAAP, excluding gains (or losses) from sales of operating property, plus depreciation and amortization and after adjustments for unconsolidated entities. In addition, NAREIT has further clarified the FFO definition to add-back impairment write-downs of depreciable real estate or of investments in unconsolidated entities that are driven by measurable decreases in the fair value of depreciable real estate and to exclude the earnings impacts of cumulative effects of accounting changes. We have adopted the NAREIT definition for computing FFO.
Due to the unique features of publicly registered, non-listed REITs, the Institute for Portfolio Alternatives, or IPA, an industry trade group, published a standardized non-GAAP financial measure known as Modified
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