There were a record 144 skyscrapers erected around the globe in 2017, with 76 in China alone.
So-called super tall towers are unusual in Los Angeles due to the city's location in an active earthquake zone.
Named 'Analemma,' the building would move around the world, slowing down over New York.
The horseshoe building would surpass the Burj Khalifa, the world's tallest-building, in length.
The development will stand "a notch" above Burj Khalifa.