Mark Koehler, Coldwell Banker Residential Brokerage Share: Mark Koehler, Coldwell Banker Residential Brokerage Visit Website Request Info 11165 N La Canada Dr Ste 175 Oro Valley, AZ 85737 520-330-7900 About Map About Full Service REALTOR®. I'm here to help you with your real estate needs. Accredited Buyer Representative (ABR), Graduate, REALTOR® Institute (GRI). Over 13 years of experience in several states. What's Nearby? Distance: 5 10 15 20 25 50 mi.