nytimes May 28, 2021 12:00pm A Historic Brooklyn Mansion Goes on the Market for $30 Million #historicbuildingsandsites #realestateandhousingresidential #realestatecommercial #tubbywilliambunker #parkslopebrooklynny #prospectparkbrooklynny #childswilliamh #news A Historic Brooklyn Mansion Goes on the Market for $30 Million The 1901 building, which faces Prospect Park, has been owned by the Brooklyn Society for Ethical Culture for 74 years and could set a borough record.