Tamir Sapir, head of the Sapir Organization, and the Duke Semans mansion
Tamir Sapir has placed the Duke Semans mansion, a 20,000-square-foot monolith at 1009 Fifth Avenue near 82nd Street, on the market for $50 million — $10 million more than the real estate mogul paid for it four years ago. The mansion, which dates back to 1901, currently houses a doctor’s office, a penthouse duplex and a five-story home, according to Curbed. Sapir, the head of the Sapir Organization, had reportedly planned to use the space to store and display his vast collection of ivory carvings.