When we last heard the words "3D building" and "Latin America" together it was because 3D structures were disappearing from Google Earth.
This time it's better news: Blog viewer and SketchUp Islander NESUA informs me that several major cities in Latin America have been enhanced with a new gray buildings layer (buildings with geometry but no textures yet).
Click the illustration to see the gray buildings layer in Rio de Janeiro, Brazil.
Other cities with new building layers (according to NESUA) include Santiago, Sao Paulo, Caracas and México City. Check them out on Google Earth and check out this blog posting NESUA also sent (in Spanish):