The Alberhill District is characterized by rolling terrain, vacant land, and the newly constructed Alberhill Ranch neighborhood. Much of the topography in the central areas, east and west of Lake Street, has been substantially altered as a result of the Alberhill District's long history of extractive/mining activities. Mining operations in the Alberhill District began at Terra Cotta roughly the same time the region's first railroad, the California Southern Railroad, was completed in the 1880s. A spur of the railroad originally built to Terra Cotta was extended into the central portion of the Alberhill District. The Atchison, Topeka, and Santa Fe Railroad built a line up from Corona through Alberhill to Elsinore after the line through Railroad Canyon was washed out in the 1920s. These events helped shape the growth of the District. Mining operations for coal and especially clay have continued to exist since the late 19th century, and occupy a significant portion of the Alberhill District. Through the years, Pacific Clay Products Company has purchased the local mines and has become the sole operating clay mine in the region. The Ballpark District takes its name from the Lake Elsinore Diamond Stadium, a first-class minor league baseball stadium constructed in 1994. It is home to the Lake Elsinore Storm professional baseball team, an affiliate of the San Diego Padres. The area was once the site of the first train depot in Lake Elsinore, but no train tracks or structures from that era remain. The developed area within the Business District, in Warm Springs Valley, is relatively new and has the strongest concentration of industrial and commercial uses within the city. In addition, it hosts several big-box retailers, the Lake Elsinore Outlets, the lake's outlet channel, Temescal Creek, and marshlands. It is bordered by Country Club Heights to the west and Interstate 15 to the east, with a small portion extending to the east side of I-15. Sections of the Atchison, Topeka, & Santa Fe Railroads that passed through the Business District during the 1800s have been removed. In addition, a historic ranching and homesteading site with previous ranching and homesteading activities is located nearby the route where the railroad once existed. The Country Club Heights District is distinctly marked by the steep hillsides of the Clevelin Hills, views of the lake and the City, and is a key part of Lake Elsinore's history. The issues mentioned above have presented development constraints for Country Club Heights since its historic beginnings dating back to 1912.