Euclid Avenue, Lee Road, and Superior Avenue) northeast and adjacent to the cemetery. In June 1874, Rockefeller sold on a hill off Forest Hills Blvd. (now Sled Hill in Forest Hill Park) to Marcus and Mary Montgomery. At a mineral spring atop the hill, the Montgomerys constructed a hotel and advertised the spring as a cure for various illnesses. Rockefeller bought back the property in 1877, and turned the hotel into his summer residence. In 1880, Dr. Nathan Hardy Ambler and his adopted son and business partner, Daniel O. Caswell, a water cure resort hotel and sanitarium at the foot of Cedar Glen. The Blue Rock Spring House remained open until 1908. The resort proved so popular that in 1884 the Cleveland Railway Company built an electric streetcar line on Cedar Avenue. Known as the Cedar Avenue Line, this streetcar ran from E. 22nd Street to the foot of Cedar Glen. Euclid Heights and streetcar lines In 1890, Patrick Calhoun purchased of wooded land atop Cedar Hill north of Cedar Road. He began development of a planned community for the wealthy and upper classes, calling it Euclid Heights. The same year, brothers Edmund and William Walton began laying out another development, Cedar Heights, along Bellfield and Grandview Avenues on the south side of Cedar Road. Calhoun and his business partner, John Hartness Brown, realized that their development would not be a success unless there was a way other than dirt roads to ascend the heights. Walking the heights, the two concluded that an electric streetcar up Cedar Glen was the best option. In 1896, Calhoun donated all his property from Euclid Avenue to the foot of Cedar Hill, and on both sides of the ravine of Cedar Glen, to the city of Cleveland and to Cleveland Metroparks. In exchange, Calhoun was given the authority to construct a double-track streetcar line up Cedar Glen. That same year, the Cleveland Railway Company extended its Euclid Avenue Line along Stearns Road to Cedar Glen, up the hill to Euclid Heights Blvd., and then along the boulevard to Coventry Road to serve Calhoun's Euclid Heights development. By 1900, the Cedar Avenue Line streetcar had made Euclid Heights a major development. Work began in 1897 to turn the rutted dirt road ascending Cedar Glen into a wide, modern parkway. Named Cedar Glen Parkway for the ravine through which it ran, the road (several hundred feet