x x x x x x x 3.Notwithstanding anything contained in sub section [1], where in respect of any vacant land any scheme for group housing has been sanctioned by any authority competent in this behalf immediately before the commencement of this Act, then, the person holding such vacant land at such commencement shall be entitled to continue to hold such land for the,purpose of group housing: Provided that no more than one dwelling unit in the group housing shall be owned by one single person; Provided further, that the extent of vacant land which such person shall be entitled to hold shall, in no case, exceed [a] the extent required under any building regulations governing such group housing; or [b] the extent calculated by multiplying the number of dwelling units in the group housin g and the appropriate ceiling limit referred to in sub section [1], whichever is less." 733 Section 5(3) prohibits transfer of the vacant land in excess of the ceiling limit or any part thereof by way of sale, mortgage, gift, lease or otherwise until the land holder has furnished a statement under Section 6 of the Act and a notification regarding the excess vacant land held by him, has been published under sub section [1] of Section 10.