Currently you can specify cellars, ground floor, top, and specific floors of a building. It would be nice if there was an option to specify a group of floors that would generate in a certain order in one of those locations. Such as 3 floors (A, B, C) that would generate at the top of a building always in the same order while the rest of the building could have a random number and assortment of floors. This way you could build structures that resemble the Empire State Building or the Chrysler building.