The owner of a house, building or property used for human occupancy, employment, recreation or other purpose, situated in the City and abutting on any street, alley or right of way in which there is now located or may in the future be located a public sanitary or combined sewer of the City, is hereby required, at his or her expense, to install suitable toilet facilities therein and to connect such facilities directly with the proper public sewer, in accordance with this chapter and regulations supplementary hereto, within ninety days after the date of official notice to do so, provided that such public sewer is within 300 feet of the property line.