The exterior material, mastic-covered brick, is a facing on cast iron. This building was designed and constructed almost 40 years before the building across the street. Mechanic’s Hall was built for the Worcester Mechanics Association. The mechanics were the businessmen, inventors and innovators of the time. They wanted a suitable place to hold meetings, hear lectures, generally make their presence known! The building contains a library, a concert hall and lecture rooms. Mechanics Hall is the “finest hall, as distinct from theater, remaining in the U.S. from the pre-Civil War decade and it has incomparable acoustics.” With the depression, WWII and the loss of interest in Mechanics Hall, the building became underused and deteriorated. Post-war uses included wrestling matches and roller skating. In 1975 it was restored by donations of countless citizens of Worcester which was to be the first major project for Preservation Worcester.