The restoration of an historic mansion at 436 West 20th St., a 10,000 s/f West Chelsea property converted into five individual, rental units - is nearing completion after 20 months. The Federal style building, constructed by the Cushman family for a merchant in the early 1800s, now showcases its original pilasters, ceiling medallions, 13 wood-burning fireplaces and re-milled floorboards throughout. The mansion sits on the Cushman Row, between 9th and 10th Aves. Each apartment boasts unique characteristics and details. "The plaster work alone on the Parlor level took 7 months of around-the-clock restoration work," said the property's co-developer and exclusive broker, Michael Bolla of Luxury Lofts and Homes who, along with business partner Michael Daniel, has overseen the renovation of the 175-year-old mansion. The homes come furnished with custom upholstery and antique pieces by the prominent George Smith furniture company. "Each item has been handpicked to complement the interiors," said Peter Howlett, George Smith director of operations, who worked closely with Bolla in creating interiors. Leases are being offered on a short-term or 12-month basis. Four of the residences have already been rented, but reservations are being taken. "This is a very rare opportunity for someone to rent an historic, one-of-a-kind space in Manhattan," said Bolla.