N.Y. Em. Dom. Proc. Law § 508
In all proceedings hereunder, the respective judicial departments and the court of claims, shall adopt rules governing the time for filing and exchange of the written appraisal reports; provided, however, that in a claim for damages arising from the acquisition of real property under subdivision (A) of section five hundred one of this chapter, the time within which the condemnor must file its appraisal shall be computed from the date on which the attorney general shall have been served in the manner provided for in section eleven of the court of claims act. Each judicial department and the court of claims also shall adopt rules requiring at a reasonable time prior to trial, the filing of supplemental reports, rebuttal memoranda and all other reports of expected expert witnesses, intended to be relied upon at the trial, other than the valuation experts.
N.Y. Em. Dom. Proc. Law § 508