One-of-a-kind landmarked limestone-fronted townhouse offered for sale for the first time in over 100 years. Designed in 1896 by notable Manhattan architect Clarence True, this unique structure is part of a row of seven distinct houses on the block. The wide limestone front is topped by a mansard roof with two large dormers. The lot dimensions are 25.30 by 74.08. The building dimensions are 25.30 by 53.0. The rear yard dimensions are 25.3 by 15.5. The total interior square footage is 6,534 on five floors with a full basement. Current use is official headquarters for a non-profit entity. Offered for sale to either another entity or as a single-family conversion. Interior space comprises 13 large rooms. There are two kitchens, three ladies and gents corporate bathrooms and one full bathroom with tub and shower. Features include skylights, bay windows, three fireplaces, walk-in closets, billiards room, wood paneled library, gallery room, ornate wood bar, coffered ceilings, center staircase with detailed wood banister, stain glass windows, stain glass closets, sliding pocket doors, patterned wood floors, mud room, rear yard and unfinished full basement. There are several large meeting rooms and offices that could easily be converted to bedrooms for a private residence. The top floor has a rear private one bedroom apartment that will be delivered vacant. This is an incredible opportunity for a buyer to restore and custom renovate this historic townhouse with existing period details. Ideally located on a beautiful tree-lined street between Riverside and West End with 25 feet of frontage along prime 91st Street. Near distance to Riverside Park and restaurants, shopping and services on Broadway.