Section 11(1)

11. (1) When the Authority is satisfied that any building and/or land in a slum area is in any respect unfit for human habitation, it may, unless in its opinion the building and/or land is not capable at a reasonable expense of being rendered so fit, serve upon the owner of the building and/or land a notice requiring him within such time not being less than thirty days as may be specified in the notice, to execute the works of improvement specified therein.