N.Y. Educ. Law § 1809
Whenever a new central school district shall be laid out and organized out of territory including existing central school districts, or whenever a central school district shall have territory annexed to it including existing central school districts, such central school district shall be entitled to receive the same apportionments as it would have received had all the districts included in the existing central school district or districts included in such territory been originally laid out and organized as a central school district; provided that the amount of the building quota or quotas if any for each central school district included in such new central school district or annexed to such central school district shall continue to be paid to the new central school district or the central school district to which such territory is annexed.
N.Y. Educ. Law § 1809