Grand Prospect Hall, also known as Prospect Hall, was a large Victorian-style banquet hall at 263 Prospect Avenue in the South Park Slope neighborhood of Brooklyn, New York City. It was primarily an event space, hosting weddings, bar and bat mitzvahs, and high-school proms. The hall was housed in a building that architect Ulrich J. Huberty designed in the French Renaissance style. The first Prospect Hall was built in 1892 by local entrepreneur John Kolle. The original structure burned down in 1900 and was replaced by a new building, which opened in 1903. It was operated by the Kolle family through 1940, when John Kolle's son, William, sold the building to a Polish-American organization. Greek-American couple Michael and Alice Halkias bought the hall in 1981 and renovated it, gaining some local celebrity for their cheaply produced television commercials. In 2020, it was sold to contractor Angelo Rigas, who announced plans to demolish and redevelop it, along with adjacent properties. Local activists organized to save the building, but the effort was unsuccessful and Grand Prospect Hall was demolished in February 2022. Grand Prospect Hall was four stories tall and faced in buff-gray brick, with pressed metal decoration that was originally colored to resemble limestone. The front portion of the building was arranged around a large central staircase and was designed with a bar, a banquet hall, and various reception and parlor rooms. The rear of the building was arranged around the ballroom, which was overlooked by two balcony levels. The basement also had facilities, including a bowling alley. The building was listed on the National Register of Historic Places. History Original Prospect Hall Prospect Hall was originally built by local entrepreneur John Kolle, a German immigrant. In 1890, he had built Tivoli Hall, a four-story concert hall in the part of South Brooklyn now known as Park Slope, for restaurateur Charles Feltman. The success of the Tivoli prompted Kolle to plan his own amusement hall. In May 1892, Kolle announced plans for Prospect Hall, which was intended to cater to the German societies and organizations of the area. It was to be located on Prospect Avenue, between Fifth and Sixth Avenues, a few blocks from Tivoli Hall. Prospect Hall was constructed at a cost of $130,000 (). An 1893 report from the Brooklyn Citizen cited the building as measuring , while a 1900 report from The New York Times said the