Hello how may I help you? hi can you please tell me what is the tallest building in Denver, Colorado? Do you mean the current one or of all time? the current one Alright. The current tallest building is Republis Plaza. do you know how tall? I'm afraid I don't know that. oh okay Is there any other info you would like to know? how about do you know what's inside? or what kind of building is it? It's a shopping center.