Developers. Seeking to build duplexes? This 16,200 SF lot can be divided into 2 lots upon which you may build a duplex each. That is a total of 4 potential units. Whether duplex townhomes for resale on each lot or duplex rentals to have 4 rental units, th is has potential. Property zoned R-2: Two-Family Residential District. Sec. 98.544. - min. lots size required for a duplex is 7,500 SF. Divide these 16,200 SF into two 8,000 + SF lots and build your two duplexes. Existing home/structure is a tear down.