acquire not more than 5 acres of land and interests in land, and improvements on the land and interests, outside the boundaries of Joshua Tree National Park, in the unincorporated village of Joshua Tree, for the purpose of operating a visitor center. (b) Boundary The Secretary shall modify the boundary of the park to include the land acquired under this section as a noncontiguous parcel. (c) Administration Land and facilities acquired under this section— (1) may include the property owned (as of the date of enactment of this section) by the Joshua Tree National Park Association and commonly referred to as the Joshua Tree National Park Visitor Center