Existing law, commonly referred to as the Density Bonus Law, requires a city or county to provide a developer that proposes a housing development, as defined, within the city or county with a density bonus, other incentives or concessions, and waivers or reductions of development standards, as specified, if the developer agrees to construct specified units and meets other requirements. Existing law, among other things, requires compliance with certain affordability requirements, including requiring that the applicant agree to ensure, and that the city, county, or city and county ensure, that a for-sale unit that qualified the applicant for the award of the density bonus is either (1) initially sold to and occupied by a person or family of very low, low, or moderate income, as specified, or (2) if the unit is not purchased by an income-qualified person or family within 180 days after the issuance of the certificate of occupancy, the unit is purchased by a qualified nonprofit housing corporation, as provided.