In the 1830s and 40s, two additional avenues were interpolated between the original avenues, largely due to the influence of real estate speculator Samuel B. Ruggles: Lexington Avenue, known south of 20th Street as Irving Place, was built between Fourth and Third Avenues to service Ruggles' Gramercy Park development, and Madison Avenue was built between Fourth and Fifth Avenues. Another interpolated avenue, between Fifth and Sixth Avenues from 14th Street to Central Park, was proposed in 1910 by Mayor William Jay Gaynor, who put great effort into promoting it. The plan died, however, when Gaynor was shot by an outraged landowner whose property would be taken for the new road. Gaynor survived, but was not able to put the necessary energy into his proposal, and it faded away. These interpolations were felt necessary because, essentially, the Commissioners had left gaps between Third and Fourth, Fourth and Fifth, and Fifth and Sixth that were too large to allow sufficient real estate development.