A.
The Board of Adjustment shall have the following powers:
2.
To hear and decide all matters referred to it or upon which it is required to pass under such ordinance;
3.
In passing upon appeals, where there are practical difficulties or unnecessary hardship in the way of carrying out the strict letter of such ordinance, to vary or modify the application of any of the regulations or provisions of such ordinance relating to the construction or alteration of buildings or structures or the use of land so that the spirit of the ordinance shall be observed, public safety and welfare secured and substantial justice done.
B.
In exercising the above-mentioned powers, such Board may, in conformity with the provisions of Sections 89.010 to 89.140, RSMo., reverse or affirm wholly or partly, or may modify the order, requirement, decision or determination appealed from and may make such order, requirement, decision or determination as ought to be made and to that end shall have all the powers of the officer from whom the appeal is taken. The concurring vote of four (4) members of the Board shall be necessary to reverse any order, requirement, decision, or determination of any such administrative official, or to decide in favor of the applicant on any matter upon which it is required to pass under any such ordinance or to effect any variation in such ordinance except as provided in Section 305.410, RSMo.