For purposes of the SR Zone, the following definitions shall apply:
ATTACHED DWELLINGA one-family dwelling unit attached to one or more one-family dwellings by common vertical walls.
PATIO HOME DWELLINGA one-family, detached dwelling unit on a separate lot with open space setbacks on three sides and with a court.
SEMIDETACHED DWELLINGA one-family dwelling attached to one other one-family dwelling by a common vertical wall, and each dwelling located on a separate lot.
SENIOR RESIDENTIAL DWELLINGA single-family dwelling unit intended, erected and restricted for the benefit of residents who are 55 years of age or older as permitted by federal housing regulations. Nothing herein shall prohibit a spouse residing in such development who is under the age of 55 years, provided that such spouse is married to and residing with a person who is a minimum of 55 years of age. No person under the age of 18 years shall be a resident of the SR Zone.
TOWNHOUSE DWELLINGA one-family dwelling unit in a row of at least three such units in which each unit has its own front and rear access to the outside; no unit is located over another unit; and each unit is separated from any other unit by one or more vertical common walls.
ZERO LOT LINE DWELLINGNot more than two patio homes attached to one another by a common vertical wall with each dwelling located on a separate lot.