The best replacement for willis tower is hancock.

The best alternatives to willis tower are rated as following:
★★★★★  hancock
★★★★  john hancock
★★★  world trade center
★★★  freedom tower
★★  one world trade
★★  sears tower
★★  empire state building
★★  one world trade center
★  hancock building
★  burj khalifa
★  hancock observatory
★  burj dubai
★  john hancock observatory
★  empire state
★  john hancock building
  taipei 101 tower
  hancock tower
  hancock center

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