(a) Any lot of record in the R-4 District at the time of the adoption hereof having a total area of less than 8.400 square feet, or a width of less than seventy feet, shall not have constructed thereon a building containing a floor area exceeding .20 square feet for each square foot of lot area.
Lot area x .20 = allowable floor area (square feet)
(b) Any lot of record in the R-4 District at the time of the adoption hereof exceeding both the area and width requirements under subsection (a) hereof, but having a total area of less than 9.600 square feet, or a width of less than eighty feet, shall not have constructed thereon a building containing a floor area exceeding .25 square feet for each square foot of lot area.
Lot area x .25 = allowable floor area (square feet)
(c) Any lot of record in the R -4 District exceeding both the area and width requirements under subsection (b) hereof, but having a total area of less than 10, 800 square feet, or a width of less than ninety feet, shall not exceed .30 square feet of floor area for each square foot of lot area.
Lot area x .30 = allowable floor area (square feet)
(d) Any lot of record in the R-4 District exceeding both the area and width requirements under subsection (c) hereof, but having a total area of less than 12,000 square feet or a width of less than 100 feet, shall not exceed .40 square feet of floor area for each square foot of lot area.
Lot area x .40 = allowable floor area (square feet)
(e) On any lot of record in the R-4 District at the time of the adoption of this Zoning Ordinance having less than 5,000 square feet of land area, one dwelling unit shall be permitted thereon provided that yard and other requirements of this Zoning Ordinance are met.