N.J. Stat. § 21:1B-3
All equipment shall be installed and maintained in a safe operating condition and in conformity with the rules and regulations adopted under section 2 of this act; however, the inspection of propane gas equipment installations inside of predominantly residential buildings and those above ground installations which are on the outside of predominantly residential buildings may be made and approved or disapproved by the Construction Code official of the respective municipality pursuant to the standards promulgated by the Commissioner of Community Affairs. For purposes of this act "predominantly residential" means and includes buildings in which people reside or dwell as distinguished from buildings which are used entirely for commercial or business purposes. The term shall also include any building having 51% or more of its total floor space devoted to dwelling purposes.
N.J.S. § 21:1B-3