High Quality Content by WIKIPEDIA articles! 23 Marina is a residential skyscraper in Dubai and was built by the Hiranandani Group based in Mumbai, India. The tower has 90 floors and is 395 m (1,296 ft). It is the world`s Tallest all-residential building. The tower has 57 swimming pools and each duplex in the tower is equipped with its own private elevator. The building and eight elevators, The tower is composed of 291 apartments.