The planning commission may authorize variances from nonprocedural requirements of this title where it can be related to a specific piece of property and strict application of the ordinance would cause undue or unnecessary hardship. No variance shall be granted under the following conditions:
A. To allow the use of property for a purpose not authorized within the zone in which the proposed use would be located;
B. To increase building height more than ten (10) percent higher than is otherwise permitted in this title, except to complete a story of which more than half falls within the allowable height limit of that zone, or to allow construction of a structure one story higher than the finished ground elevation of the highest side of the structure. In granting a variance the planning commission may attach conditions which it finds necessary to protect the best interests of the surrounding property or neighborhood and otherwise achieve the purposes of this title. (Prior code § 10.600)