Mark Seltzer, who has leased office space at the Philadelphia Navy Yard since 2006, has never been more optimistic. According to Seltzer, managing director at Ensemble Investments, 2021, 2022, and 2024 were the Navy Yard’s top office leasing years in two decades. Today, only 2,800 square feet remain available in Ensemble’s 300,000-square-foot Navy Yard portfolio. That will change in early 2026 when FS Investments vacates 201 Rouse Blvd., an 80,000-square-foot building, for University City. While Seltzer regrets their departure, he’s confident about filling the space.