UAD 3.6, UAD 3.6 rural appraisal, uniform appraisal dataset rural, UAD 3.6 compliance, appraisal shortage rural, UAD 3.6 thin markets, appraisal data standards UAD 3.6 was built for suburban markets. But 97% of US land is rural, and the new appraisal data standard creates unique challenges for thin-market appraisers. Here's what the industry needs to address.