Office Conversion City
According to the Philadelphia Business Journal, Philadelphia has the largest percentage increase from 2025 to 2026 in office-to-residential conversions of any major American city.
That’s a meaningful headline, and not just for the civic bragging rights. In the recent past, interest rates have been high enough that very few conversion projects actually pencil out. The math hasn’t worked. That Philly is leading the country in getting these deals done suggests something is finally shifting, whether it’s creative financing, city incentives, or developers accepting thinner margins to move product.
Philadelphia needs the inventory. So does the rest of America. As Bruce Katz, Niall Dammando, and Paul Williams recently wrote, citing the Center for Public Enterprise’s new report, “multifamily starts have flatlined at ~350,000 units per year for the last 40 years, compared to 1970-73 and 1982-86, when we produced 3 million units in just 4 years and 2.6 million units in five years, respectively.”
We used to build housing at roughly triple the current pace, and we did it in shorter windows. The gap between what we built then and what we build now is the whole story.
Without new supply making its way onto the market, prices keep climbing, and the idea that housing costs might fall or even hold steady starts to feel unrealistic. The downstream effects are everywhere once you look. The average first-time homebuyer is now something like 40 years old, because the amount of money it takes to buy a home keeps outpacing what people earn in their late twenties and throughout their thirties.
An entire decade of wealth-building through home equity has quietly been pushed back a generation.
The supply shortage also creates a bottleneck at the other end of the market.
Homeowners who might otherwise list their place and trade up are staying put, because there isn’t much to upgrade into, and even if there were, the rate math doesn’t work.
Why would anyone trade a two-bedroom and den for a three-bedroom if it means taking on a mortgage three points higher than what they already have?
The payment on the new place could be significantly more for one extra room. So people stay. They renovate instead. They finish the basement, push out a wall, turn the den into a proper bedroom, and decide it’s good enough for another few years.
Every one of those renovation decisions is a house that doesn’t hit the market. Multiply it across a city and you get the frozen inventory we’re living through right now. Philadelphia’s conversion surge won’t fix that on its own, but it’s one of the few levers actually moving in the right direction. More units is more units, whether they come from ground-up construction or from emptied-out office towers finally finding a second life.
