Hello how may I help you? What's the tallest building in Denver Colorado? The tallest building in Denver, CO is the Republis Plaza. How tall is that building? It's 403 meters, or 33 storeys tall Thanks a lot. Are there any tall buildings in Denver, Missouri? The First Missouri Bank building is 30 feet, or three storeys tall. Oh not very tall, well thanks for the information today! You're welcome. Is there anything else I can help with? Not at this time. Thanks again Good bye!