RSM's Philadelphia Office Is on Pace to Pass Its Blue Bell Headquarters

RSM signed a full floor lease at 1735 Market Street in Center City, 22,340 square feet on the 21st floor, moving in during the second quarter of 2026 from a slightly larger 25,827 square foot office at Duane Morris Plaza on South 17th Street. Regional leadership now expects that Market Street office to become the firm's largest Philadelphia area location, with headcount across the Center City and Blue Bell offices together already topping 600.

The math says something about how office tenants are actually growing right now. RSM added people while trimming its Center City square footage by roughly 3,500 feet, and still expects that smaller floor to eventually carry more headcount than its suburban Blue Bell office. Density and hybrid scheduling are doing the work that used to require more square footage.

For landlords holding suburban office product along Blue Bell and the Route 202 corridor, a tenant growing its urban office while its suburban footprint holds flat is the pattern to track. When headcount finally tips toward the city location, the suburban space turns into a renewal risk instead of a growth story.