Downtown St. Louis faces significant challenges in preserving affordable and workforce housing, particularly near major attractions and transit infrastructure. Mansion House meets this critical need through renovating and preserving a historic 1960s multifamily building, ensuring 75% of the units remain accessible to households earning less than 80% of Area Median Income. The property’s centralized location –directly across from Gateway Arch National Park, the second most visited national monument, and adjacent to the St. Louis Federal Reserve– makes it particularly desirable. Via the park, residents have direct access to 11 acres of parkland and 5 miles of walking and bike paths. The building’s position along the St. Louis Metrolink train line provides seamless connectivity throughout the city. 

“Historic preservation and affordable housing preservation go hand in hand in creating sustainable, mixed-income communities,” said Jeremy Keele, Managing Partner at Catalyst. “By leveraging federal and state historic tax credits, we’re able to maintain long-term affordability while simultaneously modernizing an iconic downtown building for today’s residents.”

The comprehensive redevelopment will include a complete renovation of all 415 residential units, with interiors featuring in-unit washers and dryers, modernized mechanical and utility systems that reduce the project’s operational carbon footprint, and new amenity spaces, including a reimagined rooftop deck, fitness facility, dog run, and 2nd floor promenade. Additionally, Mansion House contains 70,000 square feet of ground floor commercial space to support local businesses and facilitate meaningful community services, goods and amenities. The project will also leverage the property’s 558-stall subterranean parking garage to generate additional income by serving visitors to downtown St. Louis and the Gateway Arch.