N.J. Admin. Code § Tit. 5, ch. 10, subch. 27, app 27A
MODEL LEASE AND NOTICE PROVISION
The owner (landlord) is required by law to provide, install and maintain window guards in the apartment if a child or children 10 years of age or younger is, or will be, living in the apartment or is, or will be, regularly present there for a substantial period of time if the tenant gives the owner (landlord) a written request that the window guards be installed. The owner (landlord) is also required, upon the written request of the tenant, to provide, install and maintain window guards in the hallways to which persons in the tenant's unit have access without having to go out of the building. If the building is a condominium, cooperative or mutual housing building, the owner (landlord) of the apartment is responsible for installing and maintaining window guards in the apartment and the association is responsible for installing and maintaining window guards in hallway windows. Window guards are only required to be provided in first floor windows where the window sill is more than six feet above grade or there are other hazardous conditions that make installation of window guards necessary to protect the safety of children.
N.J. Admin. Code Tit. 5, ch. 10, subch. 27, app 27A
See: 38 N.J.R. 3947(a), 39 N.J.R. 363(b).