(1)As from the date on which any part of Richmond Terrace or of the Richmond Terrace lands or of Richmond Mews is vested in the Commissioners of Works under this Act, all the rights, powers, duties and obligations of the Paving Commissioners in relation to that part of the said Terrace, lands or Mews shall, notwithstanding anything contained in the enactments set out in Part I of the First Schedule to this Act, cease to be exercisable or to be performed by the Paving Commissioners :
Provided that—
(a)if, on the date on which the premises known as Nos. 4 and 5 Richmond Terrace or the premises known as Nos. 4 and 5 Richmond Mews are vested in the Commissioners of Works, the lease of those premises now outstanding has not been determined, the provisions of this subsection shall not have effect as respects those premises until the day after the day on which the said lease is determined ; and
(b)if, on the date on which any part of the Richmond Terrace lands is vested in the Commissioners of Works, the said lease has not been determined, the provisions of this subsection shall not have effect as respects that part of those lands so long as the lessee has any estate or interest in that part of those lands.
(2)As from the date on which the site of any part of any carriageway or footway appurtenant to Richmond Terrace or Richmond Mews is vested in the Commissioners of Works, all the rights, powers, duties and obligations of the Paving Commissioners and of the Council of the City of Westminster in relation to that part of that carriageway or footway, and in relation to any part of that carriageway or footway lying to the east of the part whereof the site is so vested shall, notwithstanding anything contained in the enactments set out in Parts I and II of the First Schedule to this Act, cease to be exercisable or to be performed by the Paving Commissioners and the said Council, and the Commissioners of Works shall have power to stop up any such part as aforesaid of that carriageway or footway :
Provided that if, on the date on which the site of any part of any such carriageway or footway lying opposite or to the west of any part of the premises mentioned in proviso (a) to the last foregoing subsection is vested in the Commissioners of Works, the lease aforesaid has not been determined, the provisions of this subsection shall not have effect as respects that part of that carriageway or footway, until the day after the day on which the said lease is determined.
(3)In lieu of the power to divert and alter part of the highway known as Whitehall Gardens conferred on the Commissioners of Works by subsection (3) of section five of the principal Act, those Commissioners shall have power, at any time after the date of vesting of the northern lands, to stop up the whole of the said highway.
(4)As from the date on which the power conferred by this section to stop up any highway or any part of any carriageway or footway is exercised, all rights of laying down or continuing any pipes, sewers, drains, electric wires or cables or other apparatus on or under, and all public rights of way over that highway or that part of that carriageway or footway shall be extinguished :
Provided that, subject to any agreement between the Commissioners of Works and the London County Council, this subsection shall not apply to any sewer of that Council.