Subject to any existing lease or any contract heretofore made and existing in respect thereof, it shall be lawful for the Nelson Diocesan Trust Board (Incorporated) to sell and dispose of the buildings on the said lands described in the Schedule hereto or any of them for removal, and to sell and dispose of the said lands or any part or parts thereof with or without the said buildings, and in either case either by public auction or private contract, and at such time or times and upon such terms and conditions in all respects as the said Board may deem fit, and to convey, transfer, and assure the same to any purchaser or purchasers freed and discharged of and from the said trust, and to apply the net proceeds thereof, after providing for the necessary cost and expenses thereof, in or towards the purchase of lands and buildings or towards the purchase of lands and erecting buildings thereon as a permanent residence for the Bishop of Nelson and his successors for all time, and pending the application of such proceeds as aforesaid to invest any moneys arising from the sale or disposition of such buildings and lands or any part thereof in any manner in which trustees may lawfully invest trust-moneys, and apply the income arising therefrom in and towards the same purposes to which the principal moneys are appropriated by this Act, or, in the discretion of the said Board, in maintaining the land and buildings at present occupied by the Bishop of Nelson as a residence.