Which of the following situations could be exempt from Fair Housing laws?

The sale of one unit in an owner-occupied three-unit building without a real estate licensee could be exempt from Fair Housing laws under specific conditions. The Fair Housing Act includes provisions that may exempt certain transactions from its non-discrimination rules. In this particular case, when the owner is occupying one of the units and sells or rents out the other unit without employing the services of a real estate licensee, the transaction can qualify for an exemption. This is often framed under the "Mrs. Murphy" exemption, which generally provides allowances for small, owner-occupied residential buildings when the owner is not acting as a professional landlord.

The other scenarios do not offer the same exemptions under Fair Housing laws. The sale of a commercial building is typically governed by different regulations and is not subject to the same protections as residential properties. The rental of a unit in a government-subsidized housing program is usually held to strict fair housing standards to ensure access and prevent discrimination. The leasing of property by a nonprofit organization generally does not exempt it from Fair Housing laws, as these organizations are often required to comply with the standards to ensure equal housing opportunities for all, regardless of the organization's status.