N.Y. Relig. Corp. Law § 19
Ten or more members of two or more incorporated churches may become a corporation for the purpose of organizing and maintaining mission churches and Sunday schools, and of acquiring property therefor, by executing a certificate stating the name of such corporation, the city in which its principal office or church or school is or is intended to be located; the number of trustees to manage its affairs, which shall be three, six or nine, and the names of the trustees for the first year of its existence, which certificate shall be acknowledged or proved and filed as hereinbefore provided. Whenever a mission church established by such corporation becomes self-sustaining, such mission church may become incorporated and shall be governed under the provisions of this chapter for the incorporation and government of a church of the religious denomination to which such mission church belongs, and thereon such parent corporation may convey to such incorporated church the property connected therewith.
N.Y. Relig. Corp. Law § 19