240 Central Park South is a 325-unit luxury apartment building and the only fully restored landmark on Columbus Circle. Completed in 1940 by Albert Mayer and Julian Whittlesey, known for Modern, middle-class apartments, this Art Deco rental building features two towers (the larger one arranged in a horseshoe plan to maximize airflow and views), cantilevered balconies, and steel casement windows. The green roofs and entry courtyard pull the character of Central Park through the building and up to the roof. 240 Central Park South was state-of-the-art green architecture before the term was coined. Shrubs and flowering plants are interwoven with lines of slate to mimicking the rock outcroppings in the park and reinforce a connection to the landscape of the park. Large planters are used to extend the foliage of the park. Passersby can see tree leaves over the wall, tenants inside the building are surrounded by plants and neighboring buildings and apartments above view the multiple levels of rooftops as they appear to join together into one unified landscape. There is a 24-hour doorman, roof top sundeck and the building is convenient to midtown. The famous French aviator and writer Antoine de Saint-Exupéry lived on the 22nd floor of the building and there began writing 'The Little Prince' ('Le Petit Prince') from July 1941 to November 1942.