The first criterion is that the property must be located within the borders of a designated Opportunity Zone. Here are the other criteria: stock in a QOZ business; partnership interest in a QOZ Business; QOZ business property; acquired after Dec. 31, 2017; original use begins with QOF or it is substantially approved (i.e., increase improvements basis by 100%) During substantially all of the QOF holding period, substantially all of the use occurred in QOZ. Note: Original use means that it could not be depreciated by the current or any prior taxpayer or if a building, it was vacant for at least five years prior to the acquisition by the QOF. Please engage and consult a tax advisor for additional details specific to your situation as this is a complex tax law.