The OPEN SPACE RATIO of a ZONING LOT is the number of square feet of OPEN SPACE on the ZONING LOT, expressed as a percentage of the FLOOR AREA on that ZONING LOT. (For example, if for a particular BUILDING an OPEN SPACE RATIO of 20 is required, 20,000 square feet of FLOOR AREA in the BUILDING would necessitate 4,000 square feet of OPEN SPACE on the ZONING LOT upon which the BUILDING stands; or, if 6,000 square feet of LOT AREA were in OPEN SPACE, 30,000 square feet of “floor area” could be in the BUILDING on that ZONING LOT.) Each square foot of OPEN SPACE per 100 square feet of FLOOR AREA is referred to as one point.