Part I: Requires the counties, no later than 12/31/2026, to adopt or amend an ordinance to allow at least two accessory dwelling units, subject to certain restrictions, on all residentially zoned lots. Prohibits private covenants for residentially zoned lots within an urban district from limiting the number of accessory dwelling units below the amount allowed pursuant to State law or the long-term rental of residential units. Part II: Requires any administrative authority to act on any application for subdivision, consolidation, or resubdivision for certain parcels to be vested in the director of the county agency responsible for land use or another county officer. Part III: Amends the calculation of impact fees for certain developments. (CD1)