Legal non-confirming duplex in Vallejo...What does that mean?

[Egan Brown]

Hi guys. I'm looking at a legal non-conforming duplex in Vallejo to do a house hack and I'm trying to understand what it's status actually means. I've seen some information on it meaning that the duplex is legally grandfathered in to be able to operate as a duplex but there are some continuous use requirements in some places. I can't seem to get a straight answer on Vallejo. Does anybody know what it means?