Wash. Rev. Code § 8.04.092
The amount paid into court shall constitute just compensation paid for the taking of such property: PROVIDED, That respondents may, in the same action, request a trial for the purpose of assessing the amount of compensation to be made and the amount of damages arising from the taking. At the trial, the date of valuation of the property shall be the date of entry of the order granting to the state immediate possession and use of the property. If, pursuant to such hearing, the verdict of the jury, unless a jury is waived by all parties, or decision of the court, awards respondents an amount in excess of the tender, the court shall order the excess paid to respondents with interest thereon from the time of the entry of the order of immediate possession, and shall charge the costs of the action to the state. If, pursuant to the trial, the verdict of the jury or decision of the court awards respondents an amount equal to the tender, the costs of the action shall be charged to the state, and if the verdict or decision awards an amount less than the amount of the tender, the state shall be taxed for costs and the state, if respondents have accepted the tender and withdrawn the amount paid into court, shall be entitled to a judgment for the difference; otherwise, the excess on deposit shall be returned to the state.
RCW 8.04.092