Cal. Penal Code § 290.010

If the person who is registering has more than one residence address at which he or she regularly resides, he or she shall register in accordance with the Act in each of the jurisdictions in which he or she regularly resides, regardless of the number of days or nights spent there. If all of the addresses are within the same jurisdiction, the person shall provide the registering authority with all of the addresses where he or she regularly resides.