During the period of operation of this Act, no relief shall be available under the provisions of section 3 in respect of the following categories of unauthorised development, namely:--
         (a) any construction unauthorised started or continued on or after the 1st day of January, 2006;
         (b) commencement of any commercial activity in residential areas in violation of the provisions of the Master Plan of Delhi 2001 on or after the 1st day of January, 2006;
         (c) encroachment on public land except in those cases which are covered under clause (c) of sub-section (1) of section 3;
         (d) removal of slums and Jhuggi-Jhompri dwellers and hawkers and street vendors, in accordance with the relevant policies approved by the Central Government for clearance of land required for specific public projects.