Water and sewer line construction is sometimes required to service unconventional townhouses called “triplex,” “quadriplex,” or “piggy backs.” Unlike conventional townhouses, they have individually metered water connections, but share a common, lower cost sewer connection. Therefore, each residential multi-unit with a shared connection is assessed at the base rate for a standard front footage of 32 feet. (Property assessments manual § 4.3, dated October 1998)