NEW YORK CITY — Cushman & Wakefield and Rudder Property Group have negotiated the $9.5 million sale of an 11,750-square-foot office cooperative in Manhattan’s Hudson Yards neighborhood. Located at 450 West 31st St., the property includes the entire 12th floor of the building as well as the penthouse. The cooperative also includes a 4,750-square-foot private terrace and a basement storage area. Carri Lyon of Cushman & Wakefield, along with Michael Rudder and Michael Heller of Rudder Property Group, represented the seller, Studio 450. Todd Korren of Avison Young represented the buyer, Melkonian Capital Management.