Main Plaza One & Collin Gray Appraisal Co. Share: Real Estate - Property Management, Rentals Main Plaza One & Collin Gray Appraisal Co. Visit Website Request Info 820 main Street Kerrville, TX 78028 (830) 285-4318 Facebook About Map About Real Estate Appraiser What's Nearby? Distance: 5 10 15 20 25 50 mi.