acres. (P) The parcel generally depicted as parcel S–3 on map 4, comprising approximately 109 acres. (Q) The parcel generally depicted as parcel S–4 on map 4, comprising approximately 26 acres. (R) The parcel generally depicted as parcel MC–1 on map 5, comprising approximately 169 acres. (S) The parcel generally depicted as parcel J–1B on map 6, comprising approximately 2,261 acres. (T) The parcel generally depicted as parcel J–1A on map 6, comprising approximately 428 acres. (5) Secretary The term Secretary means the Secretary of Agriculture. 4. Land exchange (a) In general If the Alaska Mental Health Trust offers to convey to the Secretary, in the 2 phases described in subsection (n), all right, title, and interest of the Alaska Mental Health Trust in and to the non-Federal land, the Secretary shall simultaneously convey to the Alaska Mental Health Trust, in the 2 phases described in subsection (n), all right, title, and interest of the United States in and to the Federal land. (b) Condition on acceptance Title to any non-Federal land conveyed by the Alaska Mental Health Trust to the Secretary under subsection (a) shall be in a form that is acceptable to the Secretary. (c) Valid existing rights Unless otherwise agreed to by the Secretary and the Alaska Mental Health Trust, the conveyances under subsection (a) shall be subject to any valid existing rights, reservations, rights-of-way, or other encumbrances of third parties in, to, or on the Federal land and the non-Federal land as of the date of enactment of this Act. (d) Reciprocal road easements (1) In general In conveying the Federal land and the non-Federal land under subsection (a), the Secretary and the Alaska Mental Health Trust shall exchange at no cost reciprocal easements on existing roads as necessary to access the parcels each party acquires in the exchange. (2) Public access The reciprocal easements exchanged under paragraph (1) shall provide for public access. (3) Cost-share agreement The Secretary and the Alaska Mental Health Trust may enter into