Cal. Gov't Code § 7265.3

(a) A public entity may make payments in the amounts it deems appropriate, and may provide advisory assistance under this chapter, to a person who moves from a dwelling, or who moves or discontinues his business, as a result of impending rehabilitation or demolition of a residential or commercial structure, or enforcement of building, housing, or health codes by a public entity, or because of systematic enforcement pursuant to Section 37924.5 of the Health and Safety Code, or who moves from a dwelling or who moves or discontinues a business as a result of a rehabilitation or demolition program or enforcement of building codes by the public entity, or because of increased rents to result from such rehabilitation or code enforcement. Payments prescribed by subdivision (b) of Section 7264 may also be made to persons who remain in a dwelling during rehabilitation. Payments authorized by this section and made pursuant to subdivision (b) of Section 7264 may, at the option of the public entity, be computed and reviewed annually based on actual rental increases, and may be paid monthly or annually. A public entity may also give priority to a person who moves from a dwelling, or who remains in a dwelling during rehabilitation, in utilization of local, state, or federal rental assistance programs, either to enable the person to pay increased rents or to move to other suitable housing.
A public entity assisting in the financing of rehabilitation may provide some or all of the payments authorized by this section as part of the loan for rehabilitation costs, provided that the public entity makes payments directly to the person who moves or who remains in the dwelling during rehabilitation.
(b) A public entity shall make payments in the amounts prescribed by this chapter, and shall provide advisory assistance under this chapter, to persons and families of low or moderate income, as defined in Section 50093 of the Health and Safety Code, whose rent, within one year after the rehabilitation of their dwelling is completed, is increased to an amount exceeding 25 percent of their gross income, or who move from their dwelling, as the result of a rehabilitation program in which the rehabilitation work is wholly or partially financed or assisted with public funds provided by or through the public entity.
(c) A public entity shall provide temporary housing for up to 90 days to persons displaced by rehabilitation work which is wholly or partially financed or assisted with public funds provided by or through the public entity.
(d) A person displaced by rehabilitation work which is wholly or partially financed or assisted with public funds provided by or through the public entity shall, as a condition of the financing or assistance, be given the option of relocating, after rehabilitation, in the dwelling from which the person was displaced.
(e) A public entity may limit the amounts of payments made pursuant to subdivision (b), otherwise calculated pursuant to subdivision (b) of Section 7264, to the lesser of: (i) the difference between the increased rent and 25 percent of gross income; or (ii) the difference between the increased rent and the rent immediately before the rehabilitation which was greater than 25 percent of gross income.
(f) The payments and advisory assistance as required in this section shall be mandatory only if federal or state funds are available. However, nothing shall preclude the public entity from using local funds.