NEWSDowntown Detroit's 20 tallest buildings1. Detroit Marriott at the Renaissance Center. Height: 727 feet. Floors: 70. Opened: 1977. Use: Hotel.Mary Schroeder, Special To The Free Press2. One Detroit Center. Height: 619 feet. Floors: 43. Opened: 1993. Use: Offices.Ryan Garza, Detroit Free Press3. Penobscot Building. Height: 568 feet. Floors: 47. Opened: 1928. Use: Offices.Ryan Garza, Detroit Free Press4-7: Renaissance Center towers 100, 200, 300 and 400. Height: 509 feet each. Floors: 39 each. Opened: 1977. Use: Offices.Eric Seals, DFP8. Guardian Building. Height: 496 feet. Floors: 40. Opened: 1929. Use: Offices.Ryan Garza, Detroit Free Press9. Book Tower. Height: 475 feet. Floors: 38. Opened: 1926. Use: Abandoned.Ryan Garza, Detroit Free Press10. 150 West Jefferson. Height: 455 feet. Floors: 26. Opened: 1989. Use: Offices.Manny Cristomo, Detroit Free Press11. Fisher Building. Height: 444 feet. Floors: 30. Opened: 1928. Use: Offices.Elaine Cromie, Detroit Free Press12. Cadillac Tower. Height: 438 feet. Floors: 40. Opened: 1927. Use: Offices.Mandi Wright, DFP13. David Stott Building. Height: 437 feet. Floors: 38. Opened: 1929. Use: Offices.Ryan Garza, Detroit Free Press14. One Woodward Avenue. Height: 430 feet. Floors: 28. Opened: 1963. Use: Offices.Carlos Osorio, Associated Press15. McNamara Federal Building. Height: 393 feet. Floors: 27. Opened: 1976. Use: Government.Carlos Osorio, Associated Press16. DTE Energy Headquarters. Height: 374 feet. Floors: 25. Opened: 1971. Use: Offices.Kimberly P. Mitchell, Detroit Free Press17. David Broderick Tower. Height: 369 feet. Floors: 35. Opened: 1928. Use: Mixed-use residential.Kathleen Galligan, DFP18. 211 West Fort Street. Height: 368 feet. Floors: 27. Opened: 1963. Use: Offices.Brian Manzullo, DFP19. Buhl Building. Height: 366 feet. Floors: 29. Opened: 1925. Use: Offices.Jeff Garland20. Westin Book-Cadillac Detroit. Height: 349 feet. Floors: 33. Opened: 1924. Use: Hotel.Ryan Garza, Detroit Free Press