Madison Avenue was not part of the original New York City street grid established in the Commissioners' Plan of 1811, and was carved between Park Avenue (formerly Fourth) and Fifth Avenue in 1836, due to the effort of lawyer and real estate developer Samuel B. Ruggles. Ruggles was a graduate of Yale University who had previously purchased and developed New York's Gramercy Park in 1831, who was in part responsible for the development of Union Square and who also named Lexington Avenue.