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When you add a unit to the base address, make sure that, if the unit is linked to a parcel, unlink the base address from that parcel. Is this always the case? Example: 2169 FOLSOM ST.
Treasure Island and Yerba Buena Island Addresses
Addresses on Treasure Island should be assigned to Assessor Parcel Number 1939001. This is the only legal parcel for Treasure Island and so it is the only parcel that the assessor recognizes.
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