California Code, Government Code - GOV § 7265

(a) In addition to the payments required by Section 7262, as a cost of acquisition, the public entity shall make a payment to any affected property owner meeting the requirements of this section.

(b) The affected property shall be immediately contiguous to property acquired for airport purposes and the owner shall have owned the property affected by acquisition by the public entity not less than 180 days prior to the initiation of negotiation for acquisition of the acquired property.

(c) The payment, not to exceed twenty-two thousand five hundred dollars ($22,500), shall be the amount, if any, which equals the actual decline in the fair market value of the property of the affected property owner caused by the acquisition by the public entity for airport purposes of other real property and a change in the use of the property.

(d) The amount, if any, of actual decline in fair market value of affected property shall be determined according to rules and regulations adopted by the public entity pursuant to this chapter. The rules and regulations shall limit payment under this section only to those circumstances in which the decline in fair market value of affected property is reasonably related to objective physical change in the use of acquired property.