Cal. Civ. Code § 24-34-502.2

(1) It
is an unfair or discriminatory housing practice and therefore unlawful and
prohibited:

(a) For
a person to discriminate in the sale or rental of, or to otherwise make
unavailable or deny, a dwelling to any buyer or renter because of a disability
of a buyer or renter, an individual who will reside in the dwelling after it is
sold, rented, or made available, or of any individual associated with the buyer
or renter;

(b) For
a person to discriminate against an individual in the terms, conditions, or
privileges of sale or rental of a dwelling or in the provision of services or
facilities in connection with such dwelling because of a disability of that
individual, of any individual residing in or intending to reside in that
dwelling after it is so sold, rented, or made available, or of any individual
associated with the individual.

(2) For
purposes of this section, "discrimination" includes both segregate
and separate and includes but is not limited to all of the following:

(a) A
refusal to permit reasonable modifications of existing premises occupied or to
be occupied by an individual with a disability if the modifications are
necessary to afford the individual with full enjoyment of the premises;

(b) (I) 
A refusal to make reasonable accommodations when such accommodations may be
necessary to afford the individual with a disability equal opportunity to use
and enjoy a dwelling.

(II) 
For purposes of this subsection (2)(b):

(A) 
Permitting an assistance animal in housing is presumed to be a reasonable
accommodation, so long as a housing provider has been given an opportunity to
engage in an interactive accommodation process with the individual requesting
the accommodation;

(B) The
complete prohibition of assistance animals in housing is presumed to be
discriminatory under this part 5; and

(C) A
housing provider does not engage in a discriminatory housing practice solely
for requesting reasonable documentation supporting the claim of disability or
disability-related need for an assistance animal or engaging in a good faith
interactive process to evaluate a request for an assistance animal, unless the
disability or disability-related need is obvious.

(c) In
connection with the design and construction of covered multifamily dwellings
for first occupancy after the date that is thirty months after the date of
enactment of the federal "Fair Housing Amendments Act of 1988", a
failure to design and construct those dwellings in such a manner that the
public use and common use portions of the dwellings are readily accessible to
and usable by individuals with disabilities. At least one building entrance
must be on an accessible route unless it is impractical to do so because of the
terrain or the unusual characteristics of the site. All doors designed to allow
passage into and within all premises within the dwellings must be sufficiently
wide to allow passage by individuals with disabilities using mobility devices,
and all premises within the dwellings must contain the following features of
adaptive design:

(I) 
Accessible routes into and through the dwellings;

(II) 
Light switches, electrical outlets, thermostats, and other environmental
controls in accessible locations;

(III) 
Reinforcements in bathroom walls to allow later installation of grab bars; and

(IV) 
Usable kitchens and bathrooms such that an individual using a mobility device
can maneuver about the space.

(3) 
Compliance with the appropriate requirements of the "Accessible and Usable
Buildings and Facilities" standard, or any successor standard, promulgated
and amended from time to time by the international code council (commonly cited
as ICC/ANSI A117.1) suffices to satisfy the requirements of subsection (2)(c)
of this section.

(4) As
used in this section, "covered multifamily dwellings" means:

(a) 
Buildings consisting of four or more units if such buildings have one or more
elevators; and

(b) 
Ground floor units in other buildings consisting of four or more units.