GRRA - Realtors Commercial Alliance Share: Associations GRRA - Realtors Commercial Alliance Visit Website 23 Oak Branch Dr. Greensboro, NC 27407 (336) 854-5868 (336) 292-5416 (fax) Rep Info Map Whom to Contact Michael Barr CEO Phone: (336) 854-5868 What's Nearby? Distance: 5 10 15 20 25 50 mi.