Cal. Civ. Code § 13-40-107

(1) A
landlord of nonresidential real property or a residential premises described in
section 38-12-1302 (1)(a), (1)(b), (1)(d), (1)(e), or (1)(f) or a tenant of any
property or premises may terminate a periodic tenancy at the end of the tenancy
period or elect to not renew a fixed term tenancy at the end of the fixed term
by serving written notice that expires at the end of the period or fixed term,
based on the length of the applicable tenancy described in subsection (2) of
this section.

(2) The
written notice described in subsection (1) of this section must be served
before the end of the period or fixed term, as follows:

(a) A
tenancy for one year or longer, at least ninety-one days;

(b) A
tenancy of six months or longer but less than a year, at least twenty-eight
days;

(c) A
tenancy of one month or longer but less than six months, at least twenty-one
days;

(d) A
tenancy of one week or longer but less than one month, or a tenancy at will, at
least three days;

(e) A
tenancy for less than one week, at least one day.

(3) The
written notice described in subsection (1) of this section must:

(a) 
Describe the property and the particular date when the tenancy will terminate;
and

(b) Be
signed by the landlord or tenant, the party giving such notice, or the
landlord's or tenant's agent or attorney.

(4) No
written notice under subsection (1) of this section is necessary from a tenant
with a fixed-term tenancy that is, by agreement, to end at a time certain.