16.252 Bricks. But if you decided to build only 6 or 12 floors there are less!!!! 6 baseplate 32x32 so it's perfect on your own city!!! 18 Floor Height 150cm but there is no limit!!! Perfectly stable, the building has a cross inside that allows the stability. The pillars are completely optional as the building stands perfectly in the center. To verify the feasibility personally I built only the structure of the skyscraper as you can see from the photo. By my calculations you arrive until you have 60 floors and maintain stability perfectly. 

The pattern you see in the picture has 18 floors (3 Block, each Block 6 floors), a ground floor, a complete fire scene. The interlude floors also has the possibility to have a scene with fire as you can see from the photo. The smoke of the fire is removable and changed with windows so you do not have to rebuild the whole floors if you get tired of the scene with fire. The instructions included: The Complete skyscraper (instruction Step by Step with necessary pieces divided in 5 Block, Total List of pieces and total list of pieces divided for block, XML file to import bricks in your own wanted list on BrickLink divided for 5 Blocks or Entire). The smoke of the fire antenna and all forniture of the roof Window cleaner Trees. Firefighters are excluded because they are an original set Lego. Minifig are excluded It's a big construction but don't worry this instruction are divided by section Instruction made with LPub, Project with Ldraw Bricksmith, render by LdView.