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, the liability of that owner or any subsequent owner of that land in respect of the carrying out of street works in that street under the private street works code (" the street works liability") is, as respects that frontage, to be deemed to be discharged to the extent of the sum so paid or secured.
If, when the street is declared to be a highway which for the purposes of this Act is a highway maintainable at the public expense, the said sum is found to exceed the total street works liability in respect of that frontage or there is no such liability because the street was not made up at the expense of the street works authority, the street works authority—
Where land in respect of which a sum has been paid or secured under section 219 above is subsequently divided into 2 or more parts so that 2 or more owners incur or would incur the street works liability, the sum is to be treated as apportioned between those owners according to their respective frontages, and if the sum was secured and the security is the property of one only of those owners the street works authority—
Where any refund, release or payment has been made under section 220(7) above, or under section 221 above, the foregoing provisions of this section have effect as if for references therein to a sum paid or secured there were substituted references to any sum remaining paid or secured.