N.J. Ct. R. 2:5-6

(a) Appeals. Applications for leave to appeal from interlocutory orders of courts or of judges sitting as statutory agents and from interlocutory decisions or actions of state administrative agencies or officers shall be made by serving and filing with the court or agency from which the appeal is taken and with the appellate court a notice of motion for leave to appeal, as prescribed by R. 2:8-1, within 20 days after the date of service of such order, administrative decision or notice of such administrative action. If, however, a motion to the trial court for reconsideration of the order from which leave to appeal is sought is filed and served within 20 days after the date of its service, the time to file and serve the motion for leave to appeal in the Appellate Division shall be extended for a period of 20 days following the date of service of an order deciding the motion for reconsideration. The filing of a motion for leave to appeal shall not stay the proceedings in the trial court or agency except on motion made to the court or agency which entered the order or if denied by it, to the appellate court.

(b) Cross Appeals. Applications for leave to cross appeal from interlocutory orders and administrative decisions or actions as to which leave to appeal has not already been granted shall be made by serving and filing with the appellate court a notice of motion within 20 days after the date of service of the court order or administrative decision appealed from or after notice of the agency or officer's action taken or, if no cross motion is filed, within 20 days following decision of a motion for reconsideration as provided by R. 2:5-6(a). If an appeal from an interlocutory order, decision or action is allowed, an application for leave to cross appeal (if the application has not been previously denied) may be made by serving and filing with the appellate court a notice of motion within 10 days after the date of service of the order of the appellate court allowing the appeal.

(c) Notice to the Trial Judge or Officer; Findings. A party filing a motion for leave to appeal from an interlocutory order shall serve a copy thereof on the trial judge or officer who entered the order. If the judge or officer has not theretofore filed a written statement of reasons or if no verbatim record was made of any oral statement of reasons, the judge or officer shall, within 10 days after receiving the motion, file and transmit to the clerk of the Appellate Division and the parties a written statement of reasons for the disposition. The statement may also comment on whether the motion for leave to appeal should be granted on the ground, among others, that a controlling question of law not theretofore addressed by an appellate court of this state is involved and that the grant of leave to appeal may materially advance the ultimate resolution of the matter. Any statement of reasons previously made may also be amplified.