2010 New York Code
RPP - Real Property
Article 9-B - (339-D - 339-KK) Condominium Act
339-K - Certain work prohibited.

§  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.

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