Duplexes or halfplexes are allowed by right in the RD-10 zone, the RD-15 through RD-40 zones, and in the RM-2 zone. A duplex or halfplex is allowed by right on corner lots in the RD-5 zone. A Use Permit by the Zoning Administrator is required to allow duplexes or halfplexes on interior lots in the RD-5 zone.