2006 New York Code - United States.

 
    §  400.   United States.  1.  Real property owned by the United States
  shall be exempt from taxation, except as otherwise provided by the  laws
  of the United States.
    2.  Real property occupied exclusively or in part by the United States
  pursuant to the provisions of the public buildings purchase contract act
  of  nineteen hundred fifty-four (Public Law 519, 83rd Congress) shall be
  exempt from taxation and exempt  from  special  ad  valorem  levies  and
  special  assessments  to  the  extent  provided  in section four hundred
  ninety of this chapter, during the period  that  the  United  States  is
  required  to  make  reimbursement  for  taxes  payable on such property,
  provided that the United States enters into an agreement  or  agreements
  with  the municipal corporation or corporations in which such properties
  are located, whereby it will undertake to pay a fair and reasonable  sum
  annually  on such property as taxes.  Where a part of the property is so
  occupied by the United States, such part only shall be  exempt  and  the
  remainder  thereof  shall  be  subject  to  taxation, special ad valorem
  levies and special assessments.   The sums  received  by  any  municipal
  corporation pursuant to this subdivision shall be devoted to purposes to
  which taxes may be applied.