In which type of properties must sellers disclose the presence of lead-based paint?

The requirement for sellers to disclose the presence of lead-based paint specifically applies to residential properties built before 1978. This is due to the fact that lead-based paint was commonly used in residential buildings up until that year, at which point regulations were established to limit its use due to health risks, particularly to children and pregnant women.

The disclosure obligation aims to inform potential buyers of the risks associated with lead exposure, allowing them to make informed decisions regarding the property. The legislation, known as the Residential Lead-Based Paint Hazard Reduction Act, mandates that sellers must provide a lead hazard information pamphlet to buyers, and if a property is constructed prior to 1978, they must disclose any known lead-based paint and its hazards.

Other property types, such as commercial buildings and high-rise buildings, do not fall under this specific disclosure requirement unless they are residential properties that meet the age criterion. Therefore, the correct choice focuses on residential housing built before 1978, as this aligns with federal regulations concerning lead-based paint disclosure.