(b) The Chief Administrator of the Courts, following consultation with and agreement of the Presiding Justice of the Second Judicial Department, may by administrative order establish an Integrated Youth Court in Westchester County to operate as a multi-court part of the County Court and the Family Court in such county. As provided by rules of the Chief Administrator promulgated pursuant to subdivision (c) of this section, such Integrated Youth Court, when established, shall be devoted to the hearing and determination, in a single forum, of cases simultaneously pending in such courts where:

1. (1) at least one such case is in a criminal court and at least one such case is in the Family Court;
2. (2) a defendant in each such case in a criminal court also is a respondent in each such case in the Family Court; and
3. (3) such defendant is less than 21 years of age at the time of the alleged commission of an offense prosecuted in such case in the criminal court. The Chief Administrator also may provide that a civil action pending in a City Court, Town Court or Village Court in Westchester County, or in the County Court thereof, shall be eligible for disposition in the Integrated Youth Court where such action arises out of substantially the same facts as underlie cases then pending in such court and a defendant in such action is a party to those pending cases. The Chief Administrator also may provide that, where cases are disposed of in the Integrated Youth Court, subsequent cases that would have been eligible for disposition therein were they to have been pending simultaneously with the cases already disposed of shall be eligible for disposition therein.