Philadelphia's Center City could support as many as 25,000 additional housing units, according to a new analysis from the Center City District and Central Philadelphia Development Corporation.

The report found that Center City already plays a major role in Philadelphia's housing growth. From January 2025 through June 2026, Greater Center City accounted for about 40% of all new housing completed across the city, with more than 4,000 units delivered during that period.

Office Conversions Drive Growth

One of the biggest changes taking place downtown is the conversion of older office buildings into apartments. As demand for traditional office space changes, developers are increasingly looking at obsolete or underused buildings as opportunities to create new housing.

The report estimates that the core of Center City has capacity for approximately 15,000 to 25,000 additional homes through new development and redevelopment of underused properties.

That includes surface parking lots, underbuilt parcels and other sites where residential development is already permitted.

More Housing Could Ease Pressure

Philadelphia's growing downtown housing supply is also affecting the rental market. According to the report, apartment supply in Core Center City has increased by about 3.8% annually since 2016, while rents have grown at a slower pace.

The findings suggest that continued residential construction could help Philadelphia accommodate more residents while limiting pressure on rents.

For developers, the combination of available land, existing zoning and office-conversion opportunities gives Center City significant potential for additional housing growth.

With Philadelphia continuing to pursue new housing, the estimated 15,000 to 25,000 units of remaining capacity could make Center City an important part of the city's residential development pipeline in the years ahead.