Hello how may I help you? Hi! Can you tell me what's the tallest building in Denver, Colorado? The tallest building in Denver is the Republis Plaza Okay. Can you tell me when it was built? It was built in 1997 Cool. How about the next tallest building? That would be the Davidson Tower Great. Is the tallest building in the state of Colorado also the Republis Plaza? Yes, that is correct Okay. I think that's all. Thanks! You're welcome