In order to qualify as Qualified Opportunity Zone Business Property (QOZBP), a piece of tangible property must (i) be used in the trade or business of a Qualified Opportunity Fund (QOF)/QOZB, (ii) have been (x) acquired by purchase (y) from an unrelated person (using 20% as the test for relatedness) (z) after Dec. 31, 2017, (iii) have substantially all its use in a Qualified Opportunity Zone (QOZ) and (iv) have its original use in the QOZ start with the QOF/QOZB, be "substantially improved" (in accordance with the OZ rules) or meet a certain exception as a vacant property or brownfield site.