7(1)This paragraph applies to any planning permission granted on or after 5th November 1964 but before 5th August 1965 for the erection of a building on land within the metropolitan region where either the erection of that building is not development to which these provisions apply or it is such development but no office development permit is required for it
(2)Any planning permission to which this paragraph applies shall be deemed to have been granted subject to the following condition (in addition to any other conditions imposed by the authority granting the permission), that is to say, that the use of the building, whether as originally erected or as subsequently extended or altered, shall be restricted so that (whether in consequence of a change of use or otherwise) it does not at any time contain office premises having an aggregate office floor space which exceeds 3,000 square feet.
(3)Section 82 of this Act shall have effect as if in subsection (5) the reference to sections 77 to 81 of this Act included a reference to this paragraph.
(4)For the purposes of this paragraph " office premises " has the meaning assigned by section 73(4) of this Act.