Lot width: for single-family detached dwellings, 50 feet minimum; for single-family semidetached dwellings, 35 feet minimum; for single-family attached dwellings, 20 feet minimum; for two-family detached dwellings, 50 feet minimum; for two-family semidetached dwellings, 40 feet minimum; and for two-family attached dwellings, 20 feet minimum.