(a) Timeframe. The Zoning Board of Appeals shall decide all appeals and applications within thirty (30) days after the public hearing and shall transmit a signed copy of the Board's decision to the appellant or applicant and the Zoning Administrator.
(b) Conditions. Conditions may be placed upon any zoning permit ordered or authorized by the Zoning Board of Appeals.
(c) Validity. Variances, substitutions or use permits granted by the Zoning Board of Appeals shall expire within eighteen (18) months unless substantial work has commenced pursuant to such grant.