Reidiarsce erectus ‘wader tce- eructicn, Moe-cosferm- fon me, Damaged ov srectare. TOS. (1) A building or structure lawfully under construction at the Sime of the coming into force of a zocing by-iaw shall, for the purpose of that by-law, be deemed to be & building or structure existing at that tine, (2) A lavtul use of premises existing at the time of the adoption of a zoning by-law, although such use does not conform to the provisions of the by-law, may be enntinued; but if such hon-conforming use fs discon. tinued for a period of thirty days, any future use of those premises shall, subject to the provisions of this section, be in confonnity with the pro~ visions of the 2zning by-law. (3) A Tawful use of @ building or structure existing at the time of the adoption of the zoning by-law, although such use docs not conform to the provisions of the zoning by-law, may be extended throughout the building og structure, but no structural alterations except those required by Statute o¢ by by-law or those allowed, ty the Board of Variance shall be made therein or thereto. (4) Where any building or structure the use of which doce Dot con form to the provisions of an appliczble zoning by-law is damaged or destroyed to the extent of seventy-five per centum or more of its value above its foundations, as determined by the building inspector, whose decision shalt be subject to review by the Board of Variasce, it shall fot be repaired of reconstructed, except for a conforming use in accord~ ance with the zoning by-law. (5) A change of tenants or rp of any premises or building of structure shull nut be dcemed to affect the use of the premises or building or structure within the meaning of this section, 1957, ¢. 42, 8. 702; 1958, c. 32, s. 308; 1968, c. 33, 5. 168. apres g bp scbarem nical Lt & A. vets at neo war two ge ‘ he ee line the rectererinn! Ppotiee acer cnte Sign ecdie ict poet Ley