Same-Store Communities
Our Same-Store Community properties, those acquired, developed, and stabilized prior to April 1, 2022 (for quarter-to-date comparison) and January 1, 2022 (for year-to-date comparison) and held on June 30, 2023 consisted of 51,846 apartment homes for both periods and provided 94.1% and 94.1% of our total NOI for the three and six months ended June 30, 2023, respectively.
Three Months Ended June 30, 2023 vs. Three Months Ended June 30, 2022
NOI for our Same-Store Community properties increased 6.7%, or $16.4 million, for the three months ended June 30, 2023 compared to the same period in 2022. The increase in property NOI was attributable to a 6.9%, or $24.3 million, increase in property rental income, partially offset by a 7.4%, or $7.9 million, increase in operating expenses. The increase in property rental income was primarily driven by a 7.8%, or $25.5 million, increase in rental rates and a 4.5%, or $1.7 million, increase in reimbursement and ancillary and fee income, partially offset by a $1.2 million increase in bad debt based on probability of collection and a $1.4 million increase in occupancy loss. Weighted average physical occupancy decreased by 0.4% to 96.6% and total monthly income per occupied home increased by 7.3% to $2,493.
The increase in operating expenses was primarily driven by a 12.1%, or $2.5 million, increase in repair and maintenance expense due to the increased use of third party vendors as a result of an increase in the number of homes that turned as well as the impact of inflation on those third party vendor costs and weather related events, a 14.2%, or $2.0 million, increase in utilities, which was primarily due an increase in energy costs, and a 4.6%, or $2.0 million, increase in real estate taxes due to higher assessed valuations.
The operating margin (property net operating income divided by property rental income) was 69.6% and 69.7% for the three months ended June 30, 2023 and 2022, respectively.
Six Months Ended June 30, 2023 vs. Six Months Ended June 30, 2022
NOI for our Same-Store Community properties increased 8.1%, or $38.9 million, for the six months ended June 30, 2023 compared to the same period in 2022. The increase in property NOI was attributable to a 7.5%, or $52.2 million, increase in property rental income, partially offset by a 6.3%, or $13.4 million, increase in operating expenses. The increase in property rental income was primarily driven by an 8.9%, or $57.7 million, increase in rental rates and a 5.0%, or $3.8 million, increase in reimbursement and ancillary and fee income, partially offset by a $4.4 million increase in bad debt based on probability of collection and a $3.6 million increase in occupancy loss. Weighted average physical occupancy decreased by 0.5% to 96.6% and total monthly income per occupied home increased by 8.1% to $2,479.
The increase in operating expenses was primarily driven by a 13.4%, or $5.2 million, increase in repair and maintenance expense due to the increased use of third party vendors as a result of an increase in the number of homes that were turned as well as the impact of inflation on those third party vendor costs and weather related events, a 15.0%, or $4.3 million, increase in utilities, which was primarily due an increase in energy costs, and a 4.7%, or $4.1 million, increase in real estate taxes due to higher assessed valuations, partially offset by a $1.7 million decrease in personnel costs primarily due to a refundable payroll tax credit related to the Employee Retention Credit program.
The operating margin (property net operating income divided by property rental income) was 69.8% and 69.4% for the six months ended June 30, 2023 and 2022, respectively.
Non-Mature Communities/Other
UDR’s Non-Mature Communities/Other represent those communities that do not meet the criteria to be included in Same-Store Communities, which include communities recently developed or acquired, redevelopment properties, sold or held for disposition properties, and non-apartment components of mixed use properties.
Three Months Ended June 30, 2023 vs. Three Months Ended June 30, 2022
The remaining 5.9%, or $16.2 million, of our total NOI during the three months ended June 30, 2023 was generated from our Non-Mature Communities/Other. NOI from Non-Mature Communities/Other increased by 55.0%, or $5.7 million, for the three months ended June 30, 2023 as compared to the same period in 2022. The increase was primarily attributable to a