High Quality Content by WIKIPEDIA articles! The Waterbury Municipal Center Complex, also known as the Cass Gilbert National Register District, is a group of five buildings, including City Hall, on Field and Grand streets in Waterbury, Connecticut, United States. They are large stone and brick structures, all designed by Cass Gilbert in the Georgian Revival and Second Renaissance Revival architectural styles, built during the 1910s. In 1978 they were designated as a historic district and listed on the National Register of Historic Places. They are now contributing properties to the Downtown Waterbury Historic District.