The Federal Aviation Administration has received applications for two 765-foot-tall tower tower cranes at the site of Chetrit Group’s Miami Riverwalk Towers development. The filing occurred on September 20th, and corresponds to the vertical construction of a 54-story mixed-use tower that is planned to rise at 275 Southwest 6th Street. Designed by renown architect Kobi Karp, piling work is now underway for the first of what eventually will become four towers. The mega development is projected to yield 4.2 million-square-feet including 1,678 residential units, 330 hotel rooms, 196,882-square-feet of retail space, 98,040-square-feet of office space and 30-slip marina.