Hello how may I help you? I would like to know about some geographical data. Sure! What is your question? I'd like to ask something about Denver, Colorado. Ok, what would you like to know about Denver? What is the tallest building in Denver, Colorado? The tallest building is the Republis Plaza What is the height of the Republic Plaza? It is 72 feet tall Only 72 feet? I thought it would be a lot taller than that. 72 feet confirmed.