#6. Michael Bloomberg – Manhattan, New York
Former New York City Mayor Michael Bloomberg spends most of his time at his Upper Estate Side townhouse, but he also owns estates in the Hamptons in New York, as well as in London, Bermuda, Colorado and Florida. Mr. Bloomberg’s townhouse, located at 17 East 79th St., spans five stories with a limestone exterior. During his three terms as mayor, Mr. Bloomberg lived in the townhouse instead of Gracie Mansion. He has a plan to turn it into a mega-mansion. Since 1989, he has been gradually buying up units at 19 East 79th St., the townhouse co-op that’s right next door to his current residence. Out of the six units in the white 1880 Greek-revival-style building, Bloomberg now owns five of them, according to The New York Observer.