CA Civ Proc Code Section 1263.440

(a)

The amount of any damage to the remainder and any benefit to the remainder shall reflect any delay in the time when the damage or benefit caused by the construction and use of the project in the manner proposed by the plaintiff will actually be realized.

(b)

The value of the remainder on the date of valuation, excluding prior changes in value as prescribed in Section 1263.330, shall serve as the base from which the amount of any damage and the amount of any benefit to the remainder shall be determined.