Section 54-0909. Restriction on alienation

1.   Real   property   acquired,   developed,  improved,  restored  or
  rehabilitated by or through a municipality pursuant to  paragraph  a  of
  subdivision four of section 54-0903 of this title or undertaken by or on
  behalf  of  the  city  of New York with funds made available pursuant to
  this title shall not be sold, leased, exchanged,  donated  or  otherwise
  disposed  of  or  used  for  other than public park purposes without the
  express authority of an act of the legislature, which shall provide  for
  the  substitution  of  other lands of equal environmental value and fair
  market value and reasonably equivalent usefulness and location to  those
  to  be discontinued, sold or disposed of, and such other requirements as
  shall be approved by the commissioner.
    2. Real property acquired by a not-for-profit organization with  funds
  made  available  pursuant  to paragraph b of subdivision four of section
  54-0903 of this title shall not be used in  violation  of  an  agreement
  entered  into  pursuant  to the provisions of paragraph b of subdivision
  two of section 54-0907  of  this  title,  or  sold,  leased,  exchanged,
  donated or otherwise disposed of without the express authority of an act
  of the legislature.