Final answer:
The lead disclosure form must be provided for properties built before 1978, as mandated by the Residential Lead-Based Paint Hazard Reduction Act of 1992.
Step-by-step explanation:
The lead disclosure form is a legal document that must be provided to potential buyers or renters of properties that were built before the year 1978. This requirement comes from the Residential Lead-Based Paint Hazard Reduction Act of 1992, which is part of the United States federal law.
The act demands that sellers and lessors of housing constructed prior to 1978 provide the form to disclose the presence of any known lead-based paint or lead-based paint hazards in the property.