Secondary uses of dwellings such as teaching music or art, or providing small kindergartens, play schools or day care may be approved on application to the zoning board. (Classes shall be limited to eight students or play schoolers to be in attendance at the same time. Before applying to the city council, the applicant must get written approval for their intended secondary use from all residents and property owners within a one-block radius. Application forms will be furnished by the code administrator.)