(a) Except as otherwise provided in this code, appeals from the decisions of the building official, concurrency manager, planning and zoning board or city council making determinations under this chapter, including but not limited to a finding of concurrency deficiency, refusal to issue a concurrency compliance certification, project impact determination, refusal to issue a building permit, etc., shall be taken before the board of adjustment. Any such appeal must be filed in writing with the city clerk within 20 days of rendition of the decision in question, and the reasons for such appeal shall be set forth therein. The city clerk shall arrange for an appeal hearing before the board of adjustment, and the clerk shall notify the appellant in writing of the date, time and place of the hearing.

(b) The appellant shall have the burden of affirmatively demonstrating that the decision of the city official was in error. Such official shall have the opportunity to present information and argument to support his decision.

(c) The board of adjustment shall base its decision on the requirements of the city's land development regulations. The board shall make its decision based upon its usual voting procedures. The decision shall be issued in writing stating the reasoning involved, and it shall be rendered within 60 days of the close of the hearing. No further administrative appeal is available beyond this stage, though the appellant retains the right of appeal through the judicial system as provided by law.