Insurance company Cigna is moving its offices within Midtown’s 2 Grand Central Tower. Cigna, which offers medical, dental, vision, disability and life insurance, signed a 32,700-square-foot lease on two full floors of Sovereign Partners’ 44-story office tower, which has an address of 140 East 45th Street, according to broker CBRE. Cigna has one other Manhattan office at 165 Broadway in the Financial District. Spokespeople for Cigna and Sovereign Partners did not immediately respond to requests for comment. Sovereign Partners bought the 667,000-square-foot office tower across the street from Grand Central Terminal from Rockwood Capital in December for $273 million, as Commercial Observer previously reported.