Article 11A(1)(b) of Sixth Council Directive 77/388/EEC must be interpreted as meaning that the value of a right in rem granting its holder a right of use over immovable property and the cost of completing the office building built on the land in question may be included in the taxable amount of a supply, within the meaning of Article 5(7)(a) of that directive, as amended, where the taxable person has already paid value added tax on that value and that cost, but also deducted the value added tax immediately and in full. In a situation such as that at issue in the main proceedings, where land and a building under construction on that land have been acquired with the grant of a right in rem granting its holder a right of use over such immovable property, Article 11A(1)(b) of Sixth Directive 77/388, as amended, must be interpreted as meaning that the value of that right in rem to be taken in account in calculating the taxable amount of a supply, within the meaning of Article 5(7)(a) of that directive, corresponds to the value of the amount to be paid in consideration each year for the remainder of the long lease granting the right in rem, as corrected or capitalised according to the same method used to determine the value of the grant of the long leasehold.