15USW is the 21st century artistic metamorphosis of Tiffany & Company's 19th century headquarters overlooking historic Union Square Park. The dramatic original cast-iron arched windows are set behind a new facade of black zinc and glass. The new addition has created six floors of unique penthouses with oversized terraces and gas fireplaces. This boutique condominium features 36 residences and amenities spaces custom designed by renowned interior designer Vincent Wolf with an exclusive line of kitchen and bathroom fixtures manufactured by Sherle Wagner. 15USW offers luxurious five star hotel-worthy amenities including 24 hour doorman, live-in super, onsite concierge services by Abigail Michaels, valet parking, a beautiful designed spa including a 50' lap pool with oversized whirlpool, and a state-of-the-art fitness center with yoga studio.