Affordable Housing; Requiring counties and municipalities, respectively, to authorize multifamily and mixed-use residential uses as allowable uses for specified property; providing requirements for certain proposed developments; prohibiting counties and municipalities, respectively, from restricting the height of certain proposed developments through other dimensional means and from requiring certain setbacks or stepbacks; requiring counties and municipalities to allow certain applicants to submit revised applications, written requests, and notices of intent to account for changes made by the act; .; authorizing a local government to provide a density bonus incentive to landowners who make certain real property donations to assist in the provision of affordable housing for military families; requiring the Office of Program Policy Analysis and Government Accountability to evaluate the efficacy of using mezzanine finance and the potential of tiny homes for specified purposes, etc.