In the R-20 district only the maximum allowed FAR may be increased to 0.20 provided the maximum percent lot coverage by building (column 10 of the Schedule of Area, Yard and Building Requirements, Township of Warren (Section 16-8), which is appended to subsection 16-8.1 entitled "Schedule" of Section 16-8 entitled "Schedule of District Regulations" of this Chapter 16) does not exceed 10%.