Preservation efforts by the Pittsburgh History and Landmarks Foundation, along with community neighborhood groups, resisted the demolition plans. The neighborhoods containing rich architectural heritage, including the Mexican War Streets, Allegheny West, and Manchester, were spared. The center of Allegheny City, with its culturally and socially important buildings, was not as lucky. All of the buildings, with the exception of the Old U.S. Post Office, the Carnegie Library, and Buhl Planetarium were destroyed and replaced with the "pedestrianized" Allegheny Center Mall and apartments.