The city has launched a new smoking law for apartment buildings.
The law took effect on August 28.
City officials say landlords must post or create a policy on smoking and disclose it to tenants and prospective tenants.
Building owners who fail to create and disclose a policy on smoking will be subject to $100 fines, officials say.
According to the health department, more than half of New Yorkers living in apartments report smelling cigarette smoke from other units inside their buildings.