N.J. Stat. Ann. § 55:13A-7.15

4. No tenant or occupant of a multiple dwelling unit, or any other person, shall obstruct or interfere with the installation of child-protection window guards required under section 2 of P.L.1995, c.120 (C.55:13A-7.13), nor shall any person remove or otherwise render ineffective such window guards; provided, however, that the owner or the representative of the owner may remove window guards from an unoccupied unit or, with the consent of the tenant, from a unit in which no child 10 years of age or under resides or is regularly present for a substantial period of time; and provided, further, that the owner or the representative of the owner shall remove window guards when requested to do so by the tenant in writing.