College Hill's grandest houses belonged to the industrialists of America's (and Easton's) Gilded Age. Heller owned and operated a flag factory and was responsible for putting a flag in every schoolhouse in America. At his death in 1920, his Easton business manufactured half of all flags sold in the nation. His house stands on two acres overlooking the Delaware River; legend has it that the site was an Indian lookout. Heller designed the house himself, a graceful Spanish Colonial three-story
Several blocks farther, at 800 Mixsell Street, is the prominently sited Arnold Gerstell House (1899), a characteristically animated work by William Michler, who built more than three dozen houses in the neighborhood. Gerstell was the manager of the Alpha Cement Company, under whose direction its yearly output increased from three hundred thousand barrels to seven million.