This is a building I had done 2 years ago, I never finished it (the base of the building is quite incomplete), and together with it an observation tower.
Yesterday, looking my models, I found it and I decided to improve it a big. I did not FINISH it, just added some detais, set materials, added GoogleMaps terrain and 3D buildings from Porto Alegre (most of them I did myself, when I used to do GoogleEarth models), and did some renders.
The office building (actually, its an hotel in the botton half, and office in the top half) is 200m tall and the observarion tower is 360m at top observation deck, and 480m at the top of the spire.