Mexico City limits building height to 8 stories, so architecture firm BNKR Arquitectura has proposed an inverted pyramid-shaped building to be build underground. An enormous glass ceiling would be at ground level, bringing light down through a central atrium to the floors below. The glass ceiling would also serve as a glass floor for the plaza above, allowing for public events to take place at ground level.

Comments
Anyone hear a drip?
Edward Sullivan
Given the hydrology of Mexico City, this would seem a disaster waiting (but not very long) to happen:
http://en.wikipedia.org/wiki/Water_management_in_Greater_Mexico_City
and wouldn't the whole huge structure tend to 'float' out of the Lake Texoco sediments like an long-empty backyard swimming pool?....