N.J. Stat. § 40:54-25
When, in the judgment of the board of trustees of the free public library in any municipality that shall establish a library under the provisions of this article or has heretofore established a free public library pursuant to law, it is advisable to purchase lands or erect buildings thereon, or both, or to enlarge or alter any building already erected thereon, for the purpose of a free public library, the board may certify to the board or body having charge of the finances of such municipality the amount of money, in addition to such moneys as it may have on hand applicable to such purposes, necessary for the purpose of making such purchase of land, the erection of buildings or other improvements thereof, and shall also certify therewith the total amount of moneys and funds available for the purchase of lands or erection of buildings, and an estimated account of the amount necessary for the maintenance of the library for the balance of the then current year.
Thereupon the board, or body having charge of the finances of the municipality may by resolution, at its discretion and with the approval of the mayor or other chief executive officer of the municipality, authorize and empower the board of trustees of the free public library to expend such sums of money, in addition to the moneys belonging to it and not needed for the expenses of maintenance for the remainder of the then fiscal year, as to such common council, or such other body or board, may seem proper for such purposes, not to exceed, however, the amount certified by the board of trustees of the free public library.
Upon the passage of such resolution the board of trustees of the free public library shall be empowered and authorized, with the consent of the mayor or other chief executive officer of such municipality, to purchase real estate, and to erect buildings and make improvements thereon, and to expend moneys therefor to the amount of such appropriation and surplus, but no lands shall be purchased for the purpose of erecting thereon a free public library building except with the concurrence of such common council, or such other body or board, expressed by resolution of such common council, or such other body or board with the approval of the mayor or other chief executive officer of the municipality. Any veto exercised by the mayor or other chief executive officer may be overridden by a 2/3 majority vote of the governing body of the municipality.
The title of any real estate so purchased shall be taken in the name of the municipality. The use and control of such real estate shall be in the board of trustees of the free public library so long as it shall be used for free public library purposes.
N.J.S. § 40:54-25