(b) after the completion of that part of the authorised development in the vicinity of the  building at any time up to the end of the period of 5 years beginning with the day on  which that part of the authorised development is first opened for use.  (a) any building falling within paragraph (1) and any land within its curtilage; and  (b) where necessary or expedient, land which is adjacent to the building falling within  paragraph (1) but outside its curtilage (whether or not such adjacent land is inside or  outside the Order limits),  (a) enter the building (and any land within its curtilage); and  (b) where the works cannot be carried out reasonably conveniently without entering land  which is adjacent to the building but outside its curtilage, enter the adjacent land (whether  or not such adjacent land is inside or outside the Order limits) but not any building  erected on it,  (a) a right under paragraph (1) to carry out protective works to a building;  (b) a right under paragraph (3) to enter a building (and land within its curtilage) or land;  (c) a right under paragraph (4)(a) to enter and take possession of a building (and land within  its curtilage); or  (d) a right under paragraph (4)(b) to enter and take possession of land,  (a) protective works are carried out under this article to a building; and  (b) within the period of 5 years beginning with the day on which the part of the authorised  development carried out in the vicinity of the building is first opened for use it appears  that the protective works are inadequate to protect the building against damage caused by  the carrying out or use of that part of the authorised development,  19 the undertaker must compensate the owners and occupiers of the building for any loss or damage  sustained by them.  (8) Where—  (7) The undertaker must compensate the owners and occupiers of any building or land in  relation to which rights under this article have been exercised for any loss or damage arising to  them by reason of the exercise of those rights.  (6) Where a notice is served under paragraph (5) the owner or occupier of the building or land  concerned may, by serving a counter-notice within the period of 10 days beginning with the day  on which the notice was served, require the question of whether it is necessary or expedient to  carry out the protective works or to enter the building or land to be referred to arbitration under  article 62 (arbitration).  the undertaker must, except in the case of emergency, serve on the owners and occupiers of the  building or land not less than 14 days’ notice of its intention to exercise that right and, in a case  falling within sub-paragraph (a) or (c) specifying the protective works proposed to be carried out.  (5) Before exercising—  and if it is reasonably required, the undertaker may enter and take possession, or exclusive  possession, of the building and land or any part thereof for the purpose of carrying out the  protective works.  (4) For the purpose of carrying out protective works to a building under this article the  undertaker may (subject to paragraphs (5) and (6))—  and place on, leave on and remove from the land monitoring apparatus.  (3) Subject to paragraph (5) for the purpose of determining how the functions under this article  are to be exercised the undertaker may enter and survey— 