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.

(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 thereunder shall not be binding on the Authority.