 Continuing its growth in both membership and programs during and after the Civil War, the Century Association required larger facilities.Although the club's members considered moving, financial constraints led them in 1867 to ask member and architect Charles D. Gambrill (1832–1880) to enlarge their existing structure.Gambrill's plans called for internal alterations, an expansion to the rear to accommodate an art gallery on the second floor and a billiard room on the main floor, a mansard roof, and a new unified, brick exterior trimmed with Lockport limestone.