Conditions of determination. In exercising the above-mentioned powers, such Board may, in conformity with the provisions of this Chapter, 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 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. In considering all appeals to this Chapter, the Board shall, before making any finding in a specific case, first determine that the proposed change will not constitute a change in the District Map and will not impair an adequate supply of light and air to adjacent property, or increase the congestion in public streets, or increase the danger of or materially diminish or impair established property values within the surrounding area, or in any other respect impair the public health, safety, comfort, morals and welfare of the City of Higginsville. Every change granted or denied by the Board shall be accompanied by a written finding of fact specifying the reason for granting or denying the variation.