Lot Width and Depth. Lot width may be reduced to no less than eighty feet at the building location for any lot in areas I and II. Additionally, lot width shall be not less than ninety feet at the building location for Lots 19, 20, 21, 47, 48, 49, 50 and 51 indicated on Tentative Tract Map No. 42984. Lot depth as measured at the building line may be reduced to no less than one hundred feet for all lots and shall exceed one hundred twenty feet in depth for lots in area I.