The Board of Appeals shall have the power by way of original jurisdiction and in passing on appeals where there are practical difficulties or unnecessary hardships in the way of the carrying out of the strict letter of this chapter and Chapter
12, Building Inspector; Chapter
47, Assemblies, Mass; Chapter
55, Building Construction and Fire Prevention, Art.
I; Chapter
74, Fences, Walls and Berms; Chapter
85, Flood Damage Prevention; Chapter
128, Poles, Towers and Antennas; and Chapter
137, Signs, subject to terms and conditions to be fixed by the Board; provided, however, that no such variance shall be granted unless the Board finds that:
(a) Strict application of the chapters would cause practical difficulties or unnecessary hardships.
(b) Such variance is the minimum variance that will relieve such practical difficulties or unnecessary hardships.
(c) Such variance is in the spirit of the general purposes and intent of this chapter.
(d) Such variance is so designed as to provide reasonable consideration to, among other things, the character of the neighborhood or district, the conservation of property values in the vicinity and the guidance of building development in accordance with the Master Plan.
(e) Such variance does not involve substantial detriment to the public welfare nor substantially impair the intent and purpose of the Zone Plan and of this chapter.