Housing; Requires, rather than authorizing, local governments to adopt, by specified date, ordinance to allow accessory dwelling units in certain areas; requires that such ordinances apply prospectively; prohibits inclusion of certain requirements or prohibitions in such ordinances; removes requirement that application for building permit to construct accessory dwelling unit include certain affidavit; revises accessory dwelling units that apply toward satisfying certain component of local government's comprehensive plan; prohibits denial of homestead exemption for certain portions of property on specified basis; requires that rented accessory dwelling unit be assessed separately from homestead property & taxed according to its use; authorizes local government to provide density bonus incentive to landowners who make certain real property donations to assist in provision of affordable housing for military families; requires OPPAGA to evaluate efficacy of using mezzanine finance & potential of tiny homes for specified purposes; requires office to consult with certain entities; requires office to submit certain report to Legislature by specified date.