Along with the undeveloped terrain, we also were forced to deal with a large slope differential on the jobsite. The property next to the building's rear parking lot included a large area of trees that we needed to leave undisturbed. To overcome the http://stroitel.net23.net slope differential we built an 800 liner foot, turn-up concrete retaining wall on the rear elevation. This allowed us to maintain the desired 3:1 slope and save the trees on the property adjacent to the parking lot.