Live in brand new luxury apartments in the heart of downtown St. Louis. The Tower at OPOP offers breathtaking views and amazing studio, 1 bedroom, 1 bedroom den, and penthouse apartments. These top rated apartments in St Louis, Missouri are 25 stories above Old Post Office Plaza. The Tower at OPOP is conveniently located right by all the best shopping, restaurants, and bars in STL. St. Louis Convention Center and Busch Stadium are just steps away. See why The Tower at OPOP penthouses and apartments in St Louis MO are the most popular new apts in downtown STL.