ALL OPEN HOUSES ARE BY APPOINTMENT ONLY -- PLEASE VIEW THE VIDEO FOR MORE DETAILS    Bring your contractor!   The grand scale of this elegant residence will wow you. Its large entry foyer leads to the enormous, sun-flooded living room with its nine-and-a-half-foot ceilings, decorative fireplace, and sweeping south river views. The formal dining room can easily be converted to a den or additional big third bedroom, the windowed kitchen is original (as is most of the home) and can be opened to the butler's pantry and/or the staff room, which could be the perfect home office or smaller third/fourth bedroom with its en-suite powder room.   Down a long hallway are the two very spacious and sunny bedrooms, both with en-suite, windowed bathrooms, and the primary has open south water and city views.   Additional  features of this elegant home are beamed ceilings, parquet floors, huge closets, and a washer/dryer & central air can be added.   90 Riverside Drive is a majestic prewar co-op that is pied-a-terre and pet friendly. There is a gym, basketball hoop, playroom, roof deck, deeded storage bins, and two bike rooms. The phenomenal staff offers white-glove service with  doormen  and, of course, a live-in resident manager.   Riverside Park is right outside your door, along with a parking garage and great shops like Zabar's!   Gym initiation fee of $3,000. Yearly gym fee of $318.27 per individual  residing  in the  apartment.