To contact Grandmark Properties: please email us at Grandmark Properties. Grandmark Properties is located at 2525 NW Expressway Suite 608D OKC, OK 73112, our Office Phone number is: 405.401.8001 our Fax Number is: 405.415.6763. If you prefer to write us, please send all written correspondence to: Grandmark Properties P.O. Box 13606 OKC, OK 73113. If you have an interest in a property and would one of our associates to contact you, please fill in our contact an associate form : Thank You.