it is a good, outside of the box idea, but a complete waste of time. I (oddly enough) agree with most of the people posting replies about:
1) Security... I have no doubt that it could hold up to a hurricane, as waves are less severe that far out, however security and keeping it from being tampered with is a problem.
2) Why would the CITY buy the tower? If the radar is moved, it should be federal property, not city. The city owning it would mean they would have to be liable for any damage and maintenance.
3) Move the thing to Damn Neck or Fort Story or the Eastern Shore or Sandbridge or North Carolina.