Where any land which has a frontage on a private street, and in respect of which a sum has been paid or secured under section 219 above, is subsequently divided into 2 or more parts each having a frontage on that private street, the sum is to be treated as apportioned between the owners thereof according to their respective frontages, and subsection (1) above has effect accordingly.
Where—
a sum has been paid or secured under section 219 above by the owner of land in respect of the cost of street works to be carried out in the private street on which that land has a frontage, and
thereafter the street works authority enter into an agreement with any person under section 38 above providing for the carrying out at the expense of that person of street works in respect of that frontage,
that agreement may also provide for the refund of the said sum or a part of it either without interest or with interest at such rate as may be specified in the agreement, or for the release of the whole or a part of the security, as the case may be.