The local housing authority may include in a clearance area land belonging to them which they might have included in the area if it had not belonged to them, and the provisions of this Part apply to land so included as they apply to land purchased by the authority as being comprised in the clearance area.
Where land belonging to the local housing authority is surrounded by or adjoins a clearance area and might, had it not previously been acquired by them, have been purchased by the authority under section 290(2), the provisions of this part apply to that land as they apply to land purchased by the authority as being surrounded by or adjoining the clearance area.