Pennsylvania's Montgomery County has become the most active suburban market for new apartment construction in the Philadelphia metropolitan area. Since January 2020, developers have completed 6,597 market-rate units — roughly 25% more than Chester County, which ranks second among the Philadelphia suburbs.
Montgomery County emerges as the clear leader of Philadelphia’s suburban apartment development
County has added more than 10,000 units completed and planned since 2020
CoStar Analytics
September 22, 2025 | 6:25 P.M.
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