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Mark Costello

Mark Costello

I have been a part-time resident of Block Island since 1969 when I first visited with my family.  My wife and I have owned our own home here since 1998 and have raised our two sons on the island during the summer months. During my professional career, I served as a senior executive in the real estate industry and was a longtime Partner at a global professional services firm.  I also served for many years as a board member of the Tenement Museum in New York City.