The ZBOA is a quasi-judicial body and shall have the authority to:
(1) Exercise the appropriate power, authority, duties, and procedures pursuant to the laws of the state, and applicable ordinances of the city.
(2) To hear and decide where it is alleged there is error in any order, requirement, decision or determination by the zoning official in the enforcement of these regulations. Any person may appeal a decision of the zoning official to the zoning board of adjustment as provided under state law. Such appeal shall be filed with the city secretary no later than 30 days after the date a decision is made, in writing, by the zoning official. If such person or persons fails to file such petition within the 30-day period, then the decision of the zoning official shall become final and binding.
(3) To authorize variances from these regulations where it is determined that the granting of a variance will not be contrary to the public interest where, owing to special conditions, a literal enforcement of the provisions of these regulations will result in unnecessary hardship, and so that the spirit of these regulations shall be observed and substantial justice done.