Units 319 and 320 are adorned with their corporate logo; a blue/grey stripe.
The "smoke stacks" and "connecting tube"are drinking straws & the "hoses" and "antenna" are tellephone wire from my junk box. The "hose" holders are made from Milliput.
The doors are made from foam board scraps.
The "antenna tower" is made from a drywall screw holder & the large "smoke stacks" are made from things I found, but I don't know what they are.
Finally, the "solar collector" is a broken toy part from the floor of a Toys R Us. I think it's a Bakugan or something.