The San Remo is a luxury cooperative apartment building, 27 stories high, including two 10 story towers. Architect Emery Roth, whose firm also built the Beresford and designed many office buildings in the city, created the innovative twin-tower design that was the inspiration for other buildings such as The Majestic, The Century and The El Dorado. Roth’s structure enabled more apartments with more light and air, and reduced space lost to long elevator corridors. The building, actually a U-shaped structure, offers a courtyard, which is carved out of its west side. The San Remo is truly one of the premier masterpiece buildings in the best Central Park West location. Construction began in 1929, weeks before the market crash. The San Remo was designed for 122 apartments, but that number grew over the years to 136 for during the Great Depression, many of the larger units were subdivided to make them easier to rent. More recently, however, many purchasers have combined units. The apartments are large with entrance galleries, high ceilings, and prewar details. Some are duplexes and many have terraces. The windows were an innovative design as the top transom swings out and the lower transom swings in, an attempt to improve ventilation. There are two addresses because the building was designed such that each half of the structure is served by its own magnificent lobby. White glove service, 24 hour doormen, private and semi-private elevator landings, state-of-the-art health club, community room, laundry, and storage room make the San Remo one of the city's most desirable and expensive apartment buildings .