Public Resources Code § 29522

(a) Any appealable action on a marsh development permit for any development by a local government may be appealed to the commission by any aggrieved person or by any two members of the commission. Such action shall become final after the 20th working day after receipt of the notice required by Section 29521, unless an appeal is filed within that time.

(b) If an appeal of any action on a development by any local government is filed with the commission, the operation and effect of such action shall be stayed pending the commission’s decision on the appeal.