Accessory Use means a Use which is appropriate, subordinate, incidental and customarily or necessarily related to a lawfully existing Principal Use on the same Lot or Building Site and does not alter the essential characteristics of such Principal Use as a whole and as related to other Uses permitted in the same District.' See: Olmstead v. City of San Diego (1932) 124 Cal.App. 14.
Conducting any business in a residential area would not be accessory use if the area is not zoned for business.
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