Here is a HO scale 15 story tall train set city building that will in a few months be anywhere from 40 to 70 stories tall, It is called the Diamond City Glass Insulator factory and will be across the street from a large glass factory and will be linked up to a large factory building across from it by two skybridges five and 20 stories above street level. I plan to make this building as tall if not taller then a lot of people that I know. this building is strange in the HO model building world in that it is over five stories which is about the max for most common HO scale model buildings on train sets.