The Mansion

August the Mansion occupies the oldest home in O'Fallon, Illinois — a property built in 1857 by August Wastfield and recognized as a historical landmark by both the City of O'Fallon and St. Clair County. The historic mansion has been reimagined as a restaurant and private event destination, blending its storied 19th-century architecture with contemporary dining and hospitality. The second floor, once the mansion's private living quarters, has been converted into flexible event space suited for private parties, bridal events, networking gatherings, and more. Both indoor and outdoor settings are available for private functions, and the venue offers in-house catering and rental packages to support events of varying size and style.