Hello how may I help you? Hi! How may I help? What is the tallest building in Denver Colorado? The tallest building in Denver, CO is the Republis Plaza. How tall is it? It's 714 feet tall. How many Shaqs can you fit inside of it? I'm not sure. If I had to guess, you can probably fit 6000 Shaq's in it. Can I go to the roof? Yes, you can! You need permission from the management to do so. Okay thanks for the info You're welcome!