And, yet again, a dystopian J G Ballard (late British sci-fi author and author of Empire Of The Sun) story becomes reality..

Ballard's High Rise (1975) - http://en.wikipedia.org/wiki/High_Rise - shares a lot of similarities with this outcome (though the tower in the book was in London) and is a fine read to boot. The eventual outcome is the formation of different "clans" of residents based on blocks of floors having intra-building "wars" with each other. I believe that, finally, a movie is being created of this film by the guy who created Cube.