Are there any examples of this "decking" model that have worked? What about all the businesses that occupied the old ground floor? This multi layered fantasy

Are there any examples of this "decking" model that have worked? What about all the businesses that occupied the old ground floor? This multi layered fantasy seems to have been around since GM's world fair exhibit in 1939 at least [1], but I haven't seen it work. [1]: https://en.wikipedia.org/wiki/Futurama_(New_York_World%27s_Fair) https://en.wikipedia.org/wiki/Futurama_(New_York_World%27s_F...