16x46 ft (728 sq ft) End of row lot next between 54th/55th and Market St. Zoned RM1 (residential multi family), and located in the "MIN Mixed Income Neighborhoods Overlay District".. In the zoning code it reads: "In the RM-1 district, the minimum lot area required per dwelling unit is as follows, provided that, whenever the calculation of permitted number of dwelling units results in a fraction of a dwelling unit, then the number of permitted dwelling units shall be rounded down to the nearest whole number: (.a) A minimum 240 sq. ft. of lot area is required per dwelling unit for the first 1,440 sq. ft. of lot area." This lot is 728 sq ft according to the Philadelphia atlas. Consult with your zoning professional as to what you can do. Drive by.