Maryland Code, Land Use § 8-303

(i) the historic, archaeological, or architectural significance of the site or structure and its relationship to the historic, archaeological, or architectural significance of the surrounding area;

(ii) the relationship of the exterior architectural features of the structure to the remainder of the structure and to the surrounding area;

(iii) the general compatibility of exterior design, scale, proportion, arrangement, texture, and materials proposed to be used; and

(iv) any other factors, including aesthetics, that the commission considers pertinent.