Negative Zone City

This was a city that I had started a long time ago but had never gotten around to finishing. I recently remembered it and decided to finish it and upload it here. It isn't your everyday generic city; it has a large central structure lit from within by a giant column of lava. This lava flows off of the building into the cores of 4 smaller buildings. Through these buildings one can reach one of 12 houses. All buildings can only be reached through the central building(so I suppose this city is actually just a giant building). I hope that by viewing this you might get some good ideas on what to build next.