The Secretary shall also determine the aggregate preservation rents under this subsection for each project appraised under section
4103 of this title. The aggregate preservation rents shall be used solely for the purposes of comparison with Federal cost limits under section
4105 of this title. Actual rents received by an owner (or a qualified purchaser) shall be determined pursuant to section
4109,
4110, or
4111 of this title. The aggregate preservation rents shall be established as follows: