That the developer or subdivider shall agree, in writing, in a form
to be approved or prepared by the Solicitor of the Borough, that he
will lay out and improve the streets and sanitary sewers and will
construct all of the improvements, including necessary drainage facilities,
grading, paving, curbs, gutters and other street improvements, including
storm sewers. The subdivider or developer shall also erect such monuments
within each development as are required by the Borough Engineer.