 Construction on the segment started on December 20, 1909, and was completed in September 1912.As part of negotiations between New York City, the Brooklyn Rapid Transit Company (BRT), and the Interborough Rapid Transit Company for the expansion of the city's transit network, the line was leased to a subsidiary of the BRT.The agreement, known as Contract 4 of the Dual Contracts, was signed on March 19, 1913.