The Board of Adjustment shall consist of five (5) residents appointed by the Mayor and approved by the Board of Aldermen. The term of the office of the members of the Board of Adjustment shall be for five (5) years, excepting that five (5) members first appointed shall serve respectively for terms of one (1) year; two (2) years; three (3) years; four (4) years; and five (5) years; thereafter members shall be appointed for terms of five (5) years each. Three (3) alternate members may be appointed to serve in the absence of or the disqualification of the regular members. All members and alternates shall be removable for cause by the appointing authority upon written charges and after public hearing. Vacancies shall be filled for the unexpired term of any member whose term becomes vacant. The members shall elect their own Chairman, Vice Chairman and Secretary who shall serve for one (1) year. The Board of Adjustment shall adopt rules in accordance with the provisions of any ordinance adopted pursuant to Sections 89.010 to 89.140, RSMo. Meetings of the Board of Adjustment shall be held at the call of the Chairman and at such other times as the Board of Adjustment may determine. Such Chairman, or in his/her absence the Vice Chairman, may administer oaths and compel the attendance of witnesses. All meetings of the Board of Adjustment shall be open to the public. The Board of Adjustment shall keep minutes of its proceedings, showing the vote of each member upon question or, if absent or failing to vote, indicating such fact and shall keep records of its examinations and other official actions, all of which shall be immediately filed in the office of the City Clerk and shall be a public record. All testimony, objections thereto and rulings thereon shall be recorded by a transcriptionist. The presence of three (3) members of the Board of Adjustment shall constitute a quorum for the transaction of business; however, the concurring vote of four (4) members of the Board of Adjustment shall be necessary to reverse any order, requirement, decision or determination of any such City administrative official to decide in favor of applicant.