Other income increased to $51.5 million during the nine months ended September 30, 2022 from $60.9 million for the same period in 2021. Other income during the nine months ended September 30, 2022 consisted primarily of management fees, income from our hotel properties, gains on the sale of available-for-sale securities and other ancillary income from our land and development projects and operating properties. Other income during the nine months ended September 30, 2021 consisted primarily of mark-to-market gains on an equity investment, management fees, lease termination fees, other ancillary income from our operating properties, land and development projects and loan portfolio and income from our hotel properties.
Land development revenue and cost of sales—During the nine months ended September 30, 2022, we sold land parcels and residential lots and units and recognized land development revenue of $54.4 million which had associated cost of sales of $55.4 million. During the nine months ended September 30, 2021, we sold residential lots and units and recognized land development revenue of $157.9 million which had associated cost of sales of $147.5 million. The decrease in 2022 was primarily due to a decrease in the size of our land and development portfolio.
Costs and expenses—Interest expense decreased to $76.1 million during the nine months ended September 30, 2022 from $86.1 million for the same period in 2021. The decrease in 2022 was primarily due to a decrease in the average balance of our outstanding debt as we repaid our Senior Term Loan and certain unsecured notes in 2022 (refer to Note 10 to the consolidated financial statements).
Real estate expense increased to $39.3 million during the nine months ended September 30, 2022 from $33.4 million for the same period in 2021. The increase was primarily due to an increase in expenses at certain of our operating properties that have increased operations from the prior year, which was partially offset by asset sales.
Depreciation and amortization decreased to $4.0 million during the nine months ended September 30, 2022 from $5.7 million for the same period in 2021.
General and administrative expense includes payroll and related costs, performance-based compensation, public company costs and occupancy costs. We recognized general and administrative expense of $10.4 million during the nine months ended September 30, 2022 versus $69.0 million of expense for the same period in 2021. The decrease was due primarily to a $56.2 million decrease in performance-based compensation. Our primary forms of performance-based compensation are our iPIP Plans and our annual bonus pool (refer to Note 14 to the consolidated financial statements for more information on the iPIP Plans). In addition, illustrative examples of our iPIP Plans may be found in our 2021 definitive proxy statement which is publicly available on the SEC’s website.
The provision for loan losses was $22.6 million for the nine months ended September 30, 2022 as compared to a recovery of loan losses of $7.4 million for the same period in 2021. The provision for loan losses for the nine months ended September 30, 2022 resulted primarily from a $25.0 million provision on our held-to-maturity security, which is now recorded at its expected repayment proceeds. The recovery of loan losses for the nine months ended September 30, 2021 resulted from the reversal of Expected Loss allowances on loans that repaid in full during the period and from an improving macroeconomic forecast on commercial real estate markets since December 31, 2020.
The provision for losses on net investment in leases for the nine months ended September 30, 2021 resulted from the macroeconomic forecast on commercial real estate markets.
During the nine months ended September 30, 2022, we recognized an impairment of $1.8 million on an operating property based on the expected cash flows to be received. During the nine months ended September 30, 2021, we recorded an impairment of $0.7 million in connection with the sale of residential condominiums.
Other expense was $6.6 million during the nine months ended September 30, 2022 and $1.4 million for the same period in 2021. The increase in other expenses for the nine months ended September 30, 2022 was due primarily to legal and consulting costs in connection with our Merger with SAFE.
Income from sales of real estate—During the nine months ended September 30, 2022, we recorded $1.4 million of income from sales of real estate primarily from the sale of Ground Leases. During the nine months ended September 30,