critical accounting policies under Item 7, “Management’s Discussion and Analysis of Financial Condition and Results of Operations,” in our 2020 Annual Report on Form 10-K (the “2020 Annual Report”) for the year ended December 31, 2020.
The following discussion and analysis is intended to assist readers in understanding our financial condition and results of operations during the three and nine months ended September 30, 2021 and 2020 and should be read in conjunction with the consolidated financial statements and notes thereto included in this Quarterly Report on Form 10-Q and our 2020 Annual Report.
Results of Operations for the Three Months Ended September 30, 2021 Compared to the Three Months Ended September 30, 2020
Rental revenues in total increased by approximately $607,000 to $803,000 for three months ended September 30, 2021 from $196,000 for the three months ended September 30, 2020. This consisted of an increase in rent revenues of approximately $588,000 to $789,000 for the three months ended September 30, 2021 from $201,000 for the three months ended September 30, 2020, as well as an increase in tenant reimbursements of approximately $19,000 to $14,000 for the three months ended September 30, 2021 from an expense of $5,000 for the three months ended September 30, 2020. The increase in total revenues and its related components was due to higher occupancy, higher face rents and less rent concessions at 237 11th during the three months ended September 30, 2021 compared to the three months ended September 30, 2020 due to the increased tenancy from the progress made in remediating the construction related defects.
Other income decreased by approximately $50,000 to $30,000 for the three months ended September 30, 2021 from $80,000 for the three months ended September 30, 2020 which consisted mainly of the SCA construction supervision fees we recognized during the three months ended September 30, 2021 in accordance with the revenue recognition policies effective after the closing on the sale of the school condominium to the SCA in April 2020.
In connection with the commencement of sales of residential condominium units for the three months ended September 30, 2021, we recorded gross sales proceeds of approximately $1.45 million.
Property operating expenses decreased by approximately $2.0 million to $705,000 for the three months ended September 30, 2021 from $2.7 million for the three months ended September 30, 2020. The decrease was principally due to expenses associated with 237 11th, including approximately $2.1 million in lower costs incurred during the three months ended September 30, 2021 compared to the three months ended September 30, 2020 to repair the construction related defects partially offset by $61,000 more in leasing commissions incurred during the three months ended September 30, 2021 compared to the three months ended September 30, 2020 as more apartment units are being leased as they become fully remediated. Property operating expenses consisted primarily of expenses incurred for utilities, payroll, COVID-19 related supplies and general operating expenses as well as repairs and maintenance and leasing commission at 237 11th.
Real estate tax expense for the three months ended September 30, 2021 of $17,000 remained fairly consistent with the three months ended September 30, 2020 at $19,000.
General and administrative expenses increased by approximately $29,000 to $1.2 million for the three months ended September 30, 2021 from $1.2 million for the three months ended September 30, 2020. For the three months ended September 30, 2021, approximately $106,000 related to stock-based compensation, $670,000 related to payroll and payroll related expenses, $255,000 related to other corporate expenses, including board fees, corporate office rent and insurance and $186,000 related to legal, accounting and other professional fees. For the three months ended September 30, 2020, approximately $177,000 related to stock-based compensation, $687,000 related to payroll and payroll related expenses, $241,000 related to other corporate expenses, including board fees, corporate office rent and insurance and $83,000 related to legal, accounting and other professional fees.
Pension related costs decreased by approximately $7,000 to $158,000 for the three months ended September 30, 2021 from $165,000 for the three months ended September 30, 2020. These costs represent professional fees and other periodic pension costs incurred in connection with the legacy Syms Pension Plan (see Note 7 – Pension Plan to our consolidated financial statements for further information).
In connection with the commencement of sales of residential condominium units for the three months ended September 30, 2021, we recorded cost of sales of approximately $1.4 million, which consists of construction and capitalized operating costs that are allocated to the respective condominium units being sold.