How to value Opportunity Zone commercial properties?

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We have commercial property (land) in Southern Arizona that has been designated in the "Opportunity Zone".

The opportunity zone funds is a great investment vehicle for long term investors---but how do we put a increase in "value" on the 

property? Some reports have indicated properties that have been designated in the opportunity zone funds have increased by

20-22%?  We have current value at approx. $3 Million. The program is fairly new and how do you gets comps for this possible increase?