right, title, and interest of the United States in and to a parcel of real property, including improvements thereon, consisting of approximately 44 acres known as the Peary Place Transmitter Site in Nueces County associated with Naval Air Station Corpus Christi, Texas. (b) Consideration As consideration for the conveyance under subsection (a), the City shall convey to the Secretary its real property interests either adjacent or proximate, and causing an encroachment concern as determined by the Secretary, to Naval Air Station Corpus Christi, Naval Outlying Landing Field Waldron and Naval Outlying Landing Field Cabaniss. (c) Land exchange agreement The Secretary and the City may enter into a land exchange agreement to implement this section. (d) Valuation The value of each property interest to be exchanged by the Secretary and the City described in subsections (a) and (b) shall be determined— (1) by an independent appraiser selected by the Secretary