The following discussion sets forth details of the consolidated results of operations of our commercial segment.
Total leasing revenue increased $3.3 million, or 12.2%, during the six months ended June 30, 2025, as compared to the same period in 2024. The increase was primarily due to additional commercial property leases, as well as other leases. Total leasing gross margin during the six months ended June 30, 2025 was 55.6%, as compared to 52.8% during the same period in 2024. The increase in leasing gross margin was primarily due to additional leases in the current period. As of June 30, 2025, we had net rentable square feet of approximately 1,177,000, of which approximately 1,122,000 square feet were under lease. As of June 30, 2024, we had net rentable square feet of approximately 1,100,000, of which approximately 1,058,000 square feet were under lease. As of June 30, 2025 and 2024, our consolidated entities had 1,225 and 1,235 multi-family and senior living units, respectively, of which 1,114 were leased as of June 30, 2025, compared to 1,070 leased as of June 30, 2024 (excludes 148 senior living units for the unconsolidated Watersound Fountains Independent Living JV).
Commercial and forestry real estate revenue can vary depending on the proximity to developed areas and the mix and characteristics of commercial and forestry real estate sold in each period, with varying compositions of retail, office, industrial, timber and other commercial uses. During the six months ended June 30, 2025, we had six commercial and forestry real estate sales of approximately 144 acres for $5.1 million, resulting in a gross margin of approximately 80.4%. During the six months ended June 30, 2024, we had three commercial and forestry real estate sales of approximately 243 acres for $2.1 million, resulting in a gross margin of approximately 81.0%.
Timber revenue increased $0.2 million, or 8.7%, to $2.5 million during the six months ended June 30, 2025, as compared to $2.3 million during the same period in 2024. The increase was primarily due to an increase in prices in the current period. There were 135,000 tons of wood products sold at an average price per ton of $16.90 during the six months ended June 30, 2025, as compared to 142,000 tons of wood products sold at an average price per ton of $14.48, during the same period in 2024. Timber gross margin was 84.0% during the six months ended June 30, 2025, as compared to 82.6% during the same period in 2024. The increase was primarily due to higher prices in the current period.
Other operating expenses include salaries and benefits, property taxes, CDD assessments, professional fees, marketing, project administration and other administrative expenses.
The increase of $0.5 million in depreciation, depletion and amortization expense during the six months ended June 30, 2025, as compared to the same period in 2024, was primarily due to new properties placed in service.
Interest expense primarily includes interest incurred from our commercial project financing and CDD debt. The decrease of $0.8 million in interest expense during the six months ended June 30, 2025, as compared to the same period in 2024, was primarily due to repayment of project financing and a decrease in interest rates from the prior period. See Note 8. Debt, Net for additional information.
Equity in loss from unconsolidated joint ventures includes our proportionate share of earnings or losses of unconsolidated JVs accounted for using the equity method. Equity in loss from unconsolidated joint ventures was $3.4 million during the six months ended June 30, 2025, as compared to $2.1 million for the same period in 2024. The six months ended June 30, 2025, primarily include start-up, depreciation and interest expenses related to the Pier Park RI JV, which opened a 121-room hotel in April 2024. The six months ended June 30, 2025 and 2024, primarily include lease-up, depreciation and interest expenses related to the Watersound Fountains Independent Living JV, which opened a 148-unit independent senior living community in March 2024 and is currently under lease-up. See Note 4. Joint Ventures for additional information.
Liquidity and Capital Resources
As of June 30, 2025, we had cash and cash equivalents of $88.2 million, compared to $88.8 million as of December 31, 2024.