In Sunny Isles Beach, Jade Signature, designed by the celebrated Swiss starchitects (try saying that five times fast) Herzog & de Meuron, topped off last week at about 650 feet in height. Inside, the building is already beginning to look something like the finished product.

To celebrate, developers Fortune International and general contractor Suffolk threw the traditional topping off party for the construction crew in the building’s underground parking garage. Fifty feet below ground, and built right next to the ocean on what’s basically a sandbar, this condo tower’s underground parking garage is an engineering marvel.

Photos by Sean McCaughan.