to any use permitted by this section, such as servants quarters, greenhouses, and workshop ; provided, that none shall be conducted for gain; provided, further, accessory buildings shall not exceed thirty (30) percent of the area
Read it in the chapter →How this ordinance defines it
The operative definition is the local one. Codes routinely subdivide a category into tiers — “day care 2, family”, “group home 2” — and attach different permissions to each, so only Petersburg’s own text settles what this covers.