23 CFR 710.401-.409 governs the management and disposal of real property interests acquired with TA funds, including alternate uses authorized under ROW use agreements. A TA project involving acquisition of any real property interest must have a real property agreement between FHWA and the local project sponsor that identifies the expected useful life of the TA project and establishes a pro rata formula for repayment of TA Project funding by the sponsor if:

The acquired real property interest is used in whole or in part for purposes other than the TA project purposes for which it was acquired; or
The actual TA project life is less than the expected useful life specified in the real property agreement.