The amount of the cost of filing of legal papers,
expert witnesses' fees, search fees and advertising charges incurred
in the course of any proceeding taken under this article determined
in favor of the Borough; and such repairs, alterations or improvements,
or vacating and closing, or removal or demolition, as the case may
be, shall be a municipal lien against the real property upon which
such cost was incurred. If the building is removed or demolished and
the materials of such building can be sold, the proceeds of any sale
of such materials or any sum derived from any contract for the removal
or demolition of the building shall be credited against the cost of
the removal or demolition thereof. If there are no such credits, or
if the total sum of such costs exceeds the total of such credits,
a detailed statement of the aforesaid costs and the amount so due
shall be filed as a lien certificate with the Borough Tax Assessor
or other custodian of the records of tax liens, and a copy thereof
shall be sent forthwith to the owner by registered mail.