O-A-K Colorado Share: General Contractors O-A-K Colorado Visit Website Request Info 202 6th Street Suite 200 Castle Rock, Colorado 80104 (720) 550-1396 About Map About Building since 1891, O-A-K offers commercial construction services to clients throughout the country, specifically MI, FL, CO. What's Nearby? Distance: 5 10 15 20 25 50 mi.