High Quality Content by WIKIPEDIA articles! Saco Rienk DeBoer (born September 7, 1883, Ureterp, Netherlands; died August 1974, Denver, Colorado), was a landscape architect and civic planner. He was the official Landscape Architect of Denver from 1910 to 1931. He also designed the planned community of Boulder City, Nevada. In 1919, he joined with another Dutchman, M. Walter Pesman to form a partnership. Together their projects were many, among them the landscaping of both sides of Speer Boulevard in Denver, and the innovative Bonnie Brae subdivision, with its winding streets.