New York Real Property Law
Sec. § 339-K
Certain Work Prohibited

No unit owner shall do any work which would jeopardize the soundness or safety of the property, reduce the value thereof or impair any easement or hereditament, nor may any unit owner add any material structure or excavate any additional basement or cellar, without in every such case the consent of all the unit owners affected being first obtained.
Last accessed
Dec. 13, 2016