N.J. Stat. § 40A:12-12
When a county, by resolution, or municipality, by ordinance, determines that any real property located in a foreign state is necessary to the beneficial use of property in this State owned by the county or municipality it may acquire such property located in a foreign state, either in the corporate name of the county or municipality or in the name of a trustee for the county or municipality.
In any case in which real property has been acquired pursuant to this section, and is determined by a county, by resolution, or a municipality, by ordinance, to no longer be necessary to the beneficial use of property in this State, said property shall be sold pursuant to the provisions of section 13 of this act. Such a determination shall be made in any case in which the real property in this State owned by the county or municipality, for whose beneficial use of which the real property located in the foreign state is purchased, shall have been sold or exchanged by the county or municipality.
N.J.S. § 40A:12-12