(A) Any lawfully established use of a building or land that does not conform to the use regulations for the district in which it is located shall be deemed to be a legal non-conforming use and may be continued, except as otherwise provided herein.
(B) Any legal non-conforming building or structure may be continued in use provided there are no physical changes other than necessary maintenance and repair, except as otherwise permitted herein.
(C) Any building for which a permit has been lawfully granted may be completed in accordance with the approved plans, provided construction is started within 90 days of the adopting of this chapter and diligently prosecuted to completion. The building shall thereafter be deemed a lawfully established building(s).