No yard or open space required in connection with any building or use shall be considered as providing the required open spaces for any other building on the same or any other lot.

Except as permitted hereinafter, no lot shall be formed from part of a lot already occupied by a building unless such building, all yards and open spaces connected therewith and the remaining lot comply with all requirements prescribed by this chapter for the district in which said lot is located. No permit shall be issued for the erection of a building on any new lot thus created unless such building and lot comply with all the provisions of this chapter. In cases where two or more buildings erected prior to the effective date of this chapter occupy one lot, the division of said lot in such a way as to establish a separate lot for each of said buildings may be authorized, upon application, by the Zoning Board of Appeals. In considering such application the Board shall endeavor to secure minimum possible deviations from the provisions of this chapter.

The minimum lot width or area regulations, or both, shall not apply to any lot with an area and/or width of less than that prescribed herein, provided that:

In any area where the prevailing lot width, depth and/or lot area and/or building setback is below the requirements of this chapter, the Zoning Board of Appeals may consider compliance with said requirements to cause unnecessary hardship and/or practical difficulty and may, therefore, vary such requirements, provided that the resultant lot width, depth and/or lot areas and/or building setback shall be in harmony with the pattern of development prevailing in such area.