The buildings along all throughways running in a general northerly and southerly direction shall be numbered both north and south from Columbia Street as the baseline. Two numbers shall be allowed for each twenty five feet of frontage on the throughway line and the numbering shall begin on the west side of the throughway with the number “2” and the even numbers shall be maintained on the west side of the throughway throughout – on the east side of the throughway, the numbering shall being with “1” and the odd numbers shall continue on the east side of the throughway throughout. Second and additional stories shall be designated by the addition of suite numbers to the number used for the ground floor. The units and tens shall be used in numbering the first block both north and south of Columbia Street, and thereafter each block shall begin with even consecutive hundreds, which method of numbering shall be maintained throughout.