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STAMFORD, CONN. —The Navigators Group Inc. has signed a long-term lease to occupy the entire eighth floor — totaling 36,782 square feet — at 400 Atlantic St. in Stamford. The international specialty insurance holding company will relocate its corporate headquarters from Rye Brook, N.Y., bringing with it an additional 200 jobs. Navigators joins a tenant roster at the 15-story, 500,000-square-foot Class-A office tower that includes corporations such as Charter Communications, UBS, American Express, The Santander Group and Harman Kardon. The Landis Group is the landlord at 400 Atlantic St.