PREDOMINANTLY BUILT-UP AREA

A PREDOMINANTLY BUILT-UP AREA is a block entirely within R4 or R5 Districts including a Commercial District mapped within such Residential Districts having a maximum area of 4 acres which is developed with buildings on zoning lots comprising 50 percent or more of the area of the block. However, a predominantly built-up area shall not include a block which is located partly in a R4A, R4-1, R4B, R5B or R5D District.