If you've ever wondered what U.S. cities might look like in the future, Mesa, Ariz., wants to provide the answer. The Phoenix suburb with a population larger than Miami or Cleveland has just annexed five square miles of desert, planning to create from scratch a new city center envisioned by its entrepreneurial mayor, Scott Smith. The new Mesa will have an airport at its center, rather than at its outskirts, acknowledging the importance of transportation. Homes, businesses and industrial buildings will sit on the same street, rather than being relegated to different sections of town.

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