Where a house on land acquired or appropriated by a local authority for the purposes of Part I lacks one or more of the standard amenities F1(within the meaning given by section 73(6) of the Housing (Scotland) Act 2006 (asp 1)) or does not meet the tolerable standard, the local authority may make the sale by them of that house conditional on the purchaser providing the house with the standard amenities which it lacks or bringing the house up to the tolerable standard.