No more than 10% of buildings on any named street in any district shall be converted (i.e., East DeZeng would be considered one street; West DeZeng would be considered one street; East Genesee Street would be considered one street; West Genesee Street would be considered one street; Lock Street would be considered one street). Once ten-percent conversion is reached on any named street in any zoning district, then there shall be no more conversions allowed. In computing the ten-percent limit, a building located on a corner lot, regardless of street address, shall be computed for each street the building faces.