In 1948, Crowther moved to Denver, Colorado,[1] where he built ticket booths and renovated the ballroom at Lakeside Amusement Park.
The first such theater, the Cooper Theater, in Denver, featured a 146-degree louvered screen (measuring a massive 105 feet by 35 feet), 814 seats, courtesy lounges on the sides of the theatre for relaxation during intermission (including smoking facilities), and a ceiling which routed air and heating through small vent slots in order to inhibit noise from the building's ventilation equipment.
His "Sun-Earth" text has a reputation for setting a benchmark in holistic architecture design, with arguments outlining economic and environmental benefits.
He practiced what he preached, both by living and working in holistically designed spaces, and by a diet replete with organic and natural foods.
Crowther's late modern style home at 401 North Madison Street in Denver, which he designed and had built in 1979, is, in 2022, being considered for historic preservation.