Feature list so far:
1. Make up-to 4 walls with arbitrary dimensions
2. Optional roof
3. Adjustable material colors
4. Percentage based random seed for AC units in windows (needs serious work)
5. Fire escape with adjustable position, automatically adjusts to building height (could use improvement)
Here's the final code and two shots I made with this tool.
Here's a detail shot of the materials. No textures were used, not even for the AC unit (which is just a cube).
It's hard to tell but there's also a stylized reflection on the windows.
