Isabel Marant has signed a 4,070-SF lease at the Chelsea Arts Building at 210 Eleventh Avenue, where the French fashion designer will open her first NYC showroom. The showroom, which resembles a retail space, has large windows and polished concrete floors, and boasts a private entrance which will benefit celebrities that shop with the brand. Audrey Novoa, Jakob Pedersen and Gregg Schenker of ABS Partners Real Estate represented the ownership. Paige Engeldrum of Cushman & Wakefield acted on behalf of the tenant. Other deals at the building include a renewal and expansion for Gabriela Hearst to 7,180 SF; Jay Godfrey leased 3,740 square feet on the second floor; and Michael Stars signed a 3,600-square-foot lease on the seventh floor.