Immovable properties have a specific legal and economic role. The specific role of immovable properties means that the rules governing real estate transactions are not only specific but also complex. This conclusion is shared by the renowned professor Charles E. McLure, jr. who argues that the treatment of real estate transactions from a VAT perspective is one of the most complex issues in the field of taxation. Where the subject of the transaction is real estate, further analysis is required as to which type of real estate the property is for VAT purposes, as the VAT consequences for each type of real estate are significantly different. The primary level of distinction between the different types of real estate is whether the property is unbuilt or built-in. In the present study, I address the issues related to the definition of built-in real estate.