In 1866, Jerome bought the estate and mansion of James Bathgate near Old Fordham Village in what was then rural Westchester County, but is now The Bronx. Jerome and financier August Belmont, Sr. built Jerome Park Racetrack on the Bathgate land; the first Belmont Stakes was held there in 1867. Jerome and his brother Lawrence had a wide boulevard made from Macombs Dam to the track, which city authorities attempted to name "Murphy Avenue" after a local politician. This incensed Jerome's wife so much that she had bronze plaques saying "Jerome Avenue" made up and bolted into place along the road, forcing the city to accept the name. The racetrack was acquired and demolished by the city in 1894, to make way for Jerome Park Reservoir. The Bathgate mansion served as a summer home for the Jerome family. In the early 1900s, the mansion was razed and replaced by the Kingsbridge Armory.