If you didn’t know that this building had a rich history, steeped in one of New York City's oldest private clubs, the Venetian gothic exterior at 25 8th Avenue in Park Slope would probably give it away. This elegant residence occupies a full floor — roughly 4,000 square feet -- of the Montauk Club building. In addition to its beautiful architecture, the space is accessible through a  keyed elevator, which leads to a private landing. Sunlight pours in from four exposures and the home boasts great views of Prospect Park and Grand Army Plaza.