Mark Koehler, Long Realty Company Share: Real Estate Sales Mark Koehler, Long Realty Company Visit Website Request Info 1890 E. River Rd. Tucson, AZ 85718 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.