BTI Appraisal Los Angeles, founded by Ben Tunnell, is an appraisal company with appraisers who provide a high level of residential real estate appraisals, commercial real estate appraisals, business valuations, billboards, and machinery and equipment appraisals for business, professional, public and private sectors. Although physically based in Los Angeles, BTI Appraisals is broadbased and serves California and all states in the United States.