law: Land Ports Authority of India Act, 2010
  Section 18 Mode of executing
  
  contracts on behalf of Authority
  1.  
  
    Every
  
  contract on behalf of the Authority, shall be made by the Chairperson or such
  
  officer of the Authority as may be generally or specially empowered in this
  
  behalf by the Authority and such contracts as may be specified, in the
  
  regulations, shall be sealed with the common seal of the Authority:
  Provided that no
  
  contract exceeding such value or amount as the Central Government may, by order
  
  fix in this behalf, shall be made unless it has been previously approved by the
  
  Central Government:
  Provided further that
  
  no contract for the acquisition or sale of immovable property or for the lease
  
  of any such property for a term exceeding thirty years and no other contract
  
  exceeding such value or amount as the Central Government may, by order fix in
  
  this behalf, shall be made unless it has been previously approved by the
  
  Central Government.
  1.  
  
  
  2.  Subject
  
  to the provisions of sub-section (1), the form and manner in which any contract
  
  shall be made under this Act shall be such as may be provided by regulations.
  3.  Any
  
  contract which is not in accordance with the provisions of this Act and the
  
  rules and regulations made there under shall not be binding on the Authority.