(1) For purposes of this section, "design review" means a formally adopted local government process by which projects are reviewed for compliance with design standards for the type of use adopted through local ordinance.

(2) Except as provided in subsection (3) of this section, counties and cities planning under RCW 36.70A.040 may apply in any design review process only clear and objective development regulations governing the exterior design of new development. For purposes of this section, a clear and objective development regulation:

(a) Must include one or more ascertainable guideline, standard, or criterion by which an applicant can determine whether a given building design is permissible under that development regulation; and

(b) May not result in a reduction in density, height, bulk, or scale below the generally applicable development regulations for a development proposal in the applicable zone.

(3) The provisions of subsection (2) of this section do not apply to development regulations that apply only to designated landmarks or historic districts established under a local preservation ordinance.

(4) Any design review process must be conducted concurrently, or otherwise logically integrated, with the consolidated review and decision process for project permits set forth in RCW 36.70B.120(3), and no design review process may include more than one public meeting.

(5) A county or city must comply with the requirements of this section beginning six months after its next periodic comprehensive plan update required under RCW 36.70A.130.