In R-1 Residential Districts all lots shall have a minimum frontage of one hundred (100) feet and a minimum depth of one hundred forty (140) feet. No building shall be used for other than a one (1) family dwelling house with attached or detached garage. The dwelling house shall have a first floor area not less than one thousand eight hundred (1,800) square feet if it is of the single story or split level type. If the dwelling house exceeds one (1) story in height, it shall have a first floor area not less than one thousand one hundred (1,100) square feet and a gross floor area not less than two thousand two hundred (2,200) square feet. In no case shall a boarding house or rooming house be considered a one (1) family dwelling.