The following regulations shall apply in all zoning districts:
A.
Conformity required. No building or land shall hereafter be used or occupied and no building or part thereof shall be erected, moved or altered unless in conformity with the regulations herein specified for the district in which it is located or is to be moved.
B.
Conversions in historic structures. In structures certified by the Board of Trustees as historic structures, the Zoning Board of Appeals may permit the conversion of a one-family dwelling into a maximum of three separate dwelling units where such conversion is necessary to preserve the historic structures, provided that each dwelling unit shall contain the minimum livable floor area required in that district and further subject to the issuance of a certificate of appropriateness by the ARB.
C.
Completion of structures for which permit has been issued. Nothing in this chapter shall be deemed to require any change in the plans, construction or designated use of any building for which a permit was duly issued and on which actual construction was lawfully begun prior to the adoption of this chapter and upon which building actual construction has been diligently carried on. "Actual construction" is hereby defined to be the actual placing of construction materials in their permanent position, fastened in a permanent manner, except that where a basement or cellar is being excavated, such excavating shall be deemed to be actual construction, or where demolition or removal of an existing structure has been begun preparatory to rebuilding, such demolition and removal shall be deemed to be actual construction, provided that actual construction work shall be diligently carried on and the building completed within 12 months from the passage of this chapter. Similarly, whenever a district shall be changed hereafter, the provisions of this chapter with regard to building permits issued prior to the passage of this chapter shall apply to building permits issued for construction in such changed district prior to the time of adoption of the amendment effecting such change.
D.
Conflicting standards. In case of conflict within this chapter or between this chapter and any other Village statute, bylaw, local law or regulations, the more restrictive standard shall apply. Examples of such standards would include but not be limited to greater width or size of yards or other open spaces or a lower height of building or a fewer number of stories or a greater percentage of lot area to be left unoccupied.
E.
In no instance shall the occupancy of any dwelling unit exceed a total of 1.5 persons per habitable room nor shall there be less than 200 square feet of livable floor area per person.