The original plans for Belvedere Castle called for two turreted stone towers: a larger structure on the eastern elevation and a smaller structure on the west side. Under Tammany Hall's leadership, it was revised in November 1870 to reduce costs and was completed as an open painted-wood pavilion. The eastern structure was completed by 1871, while the western structure was never built. As the plantings matured, the castle has been obscured from its original intended viewpoint. Its turret is the highest point in the park.