cent lots when: (1) The group of adjacent lots includes at least three, but not more than five, lots. (2) For a main building constructed on an end lot of such a group of lots, a side yard as required in paragraph (b)(1) of this subdivision is provided and maintained abutting the outermost lot line. (3) The main building on each lot of such group of lots is structurally independent with an unpierced wall from the ground to the weatherproofing material of the roof covering between it and any adjacent main building. 3. Rear Yard – There shall be a rear yard of not less than 15 feet in depth. Notwithstanding any provisions of this article to the contrary, the rear lot line is that line opposite and most distant from the lot line separating the narrowest canal frontage of the lot from the navigable public canal or waterway. (Amended by Ord. No. 150,336, Eff. 12/31/77.) 4. Lot Area – Every lot shall have a minimum width of 28 feet and a minimum area of 2,300 square feet. The minimum lot area per dwelling unit shall be 1,150 square feet. 5. Open Space – Same as required in “RW1” Zone – Section 12.08.5 C.5. 6. Limitations – (Amended by Ord. No. 150,336, Eff. 12/31/77.) – No person shall be issued a building permit for any lot being developed without a side yard on each side of the main building until: (a) A site plan has been first filed with and approved by the City Planning Commission pursuant to Sec. 13B.2.3 (Class 3 Conditional Use Permit) of Chapter 1A of this Code. Buildings constructed upon said lot must conform to the approved site plan. Every person applying for a building permit for such a lot shall file with the City Planning Commission a site plan which will show the location of the proposed building or buildings and the location of any existing buildings on adjacent lots. Said site plan shall be accompanied by such other plans or data as may be required by the Commission; and (Amended by Ord. No. 187,712, Eff. 1/23/23, Oper. 1/22/24; Ord. No. 187,930, Eff.