Anything in this chapter of the Code of the Town of Bethany Beach to the contrary notwithstanding, any building or structure existing in the R-1A Zoning District as of the effective date of this chapter may be reconstructed, repaired, renovated or remodeled from time to time and at anytime to and within its present dimensions, setbacks, structural configuration, density and use as a matter of right, and the same shall be deemed to be lawfully conforming in use and dimension and not as nonconforming in use or dimension; provided, however, that such reconstruction, repair, renovation or remodeling shall not reduce the amount of off-street parking or other supplementary zoning requirements below those actually provided and in existence as of the effective date of the Zoning Map amendment effected by this chapter or those ordinarily required in R-1 Residential District, whichever is the least demanding standard.