(a) Promptly after the community appearance board has rendered a decision on a particular application, the board shall prepare and deliver to the applicant thereof a formal written notice which indicates its decision on the application (approval, approval with conditions, denial). If the application is approved with conditions, the notice shall contain a statement which clearly indicates the conditions. If the application is denied, the notice shall contain a statement which indicates the rationale for denial.

(b) Approvals by the board shall be valid for a maximum of 12 months from the date the board renders its approval at a public meeting. If the applicant fails to obtain a building permit within the 12-month period, the board's approval shall expire at the end of the period. However, once a building permit is issued, the approval shall be valid for a time period equal to the permit and shall expire only if the building permit expires. Notwithstanding the aforesaid, the board may approve extensions for good cause shown including, but not limited to, a building permit application pending with the city related to the approval, natural disasters, and reasonable permitting and construction delays.