A demolition order—
(a) shall specify the building in respect of which the demolition order is made; and
(b) may stipulate that the building concerned be vacated by all or any of its occupants—
(i) if the building is in a dangerous condition, forthwith; or
(ii) within a period of not less than thirty days; and
(c) shall require the owner of the building concerned to demolish the building and remove from the site thereof such materials and debris as may be specified in the demolition order; and
(d) shall determine the period during which the demolition and removal referred to in paragraph (c) shall be commenced and completed.