According to Enriched Data, the Guesstimate is a starting point in determining a property value, including public data and comparable sales.
The accuracy of the Guesstimate varies by location depending on how much information is publicly available, but Enriched Data allows users to check the accuracy of Guesstimate in their own region against actual sales. In many U.S. states, information on the transfer prices of real estate is readily available and accessible by the general public and is not exclusively held in realtors' databases. Sales comparable and calculation are made using a proprietary algorithm of Enriched Data.
Covers more than 90% of the commercial properties in USA.
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Guesstimate provides approximate value of the property which will be helpful for you to do various analysis and take decisions.