San Fernando, Cal., Code of Ordinances ch. 24 § 24-5

The following requirements apply to multi-unit housing other than units in a common interest development that are not being rented: (1)
On or before July 7, 2022, every landlord shall deliver to a tenant of each new unit or existing unit, as applicable, a copy of this chapter and a written notice clearly stating:
a. All new units and existing units governed by a new lease are designated nonsmoking units and smoking is prohibited in any such unit, including any associated private balcony, porch, deck, or patio, with the exception of enclosed areas of a detached unit, as of July 7, 2022;
b. All units are designated nonsmoking units and smoking is prohibited in any unit, including any associated private balcony, porch, deck, or patio, with the exception of enclosed areas of a detached unit, as of July 7, 2024; and
c. All common areas with the exception of Designated Smoking Areas in compliance with section 24-2 (d) are designated nonsmoking and smoking is prohibited as of July 7, 2024; and
d. The entire premises, including all units, any associated private balcony, porch, deck, or patio, and all common areas, are designated nonsmoking and smoking is prohibited anywhere on the premises effective as of July 7, 2027.
(2) As of July 7, 2022, every landlord shall provide prospective tenants with written notice clearly stating that:
a. All units are designated nonsmoking and smoking is prohibited in any unit, including any associated private balcony, porch, deck, or patio, with the exception of enclosed areas of a detached unit, as of July 7, 2024; and
b. All common areas, with the exception of Designated Smoking Areas in compliance with section 24-2 (d) are designated nonsmoking and smoking is prohibited as of July 7, 2024; and
c. The entire premises, including all units, any associated private balcony, porch, deck, or patio, and all common areas, are designated nonsmoking and smoking is prohibited anywhere on the premises effective as of July 7, 2027.
(3) As of July 7, 2024, the person or persons with legal control over common areas shall post and maintain clear and unambiguous "No Smoking" signs at entrances and exits, in common areas, and in conspicuous places adjoining the property grounds. In addition, as of July 7, 2024, the person or persons with legal control over the multi-unit housing shall post and maintain signs in sufficient numbers and locations in the multi-unit housing to indicate that smoking is prohibited in all units. The absence of signs shall not be a defense to a violation of any provision of this chapter. "No Smoking" signs are not required inside or on doorways of units.
(4) Landlords with knowledge of violations shall take reasonable steps to investigate and enforce the regulations, including a written notice to the resident of the landlord's knowledge of the violation, a request to cease the violation, and the course of action to be taken if the violation is not corrected. The landlord shall also provide resources provided by the City and/or County of Los Angeles to assist with nicotine dependence, such as referrals to quitline or online resources.