The Companies are authorized, if they deem it necessary to the
construction or to the efficient operation of the terminal passenger
yard or freight yard, to depress, at their expense, any pipes or other
sub-surface structures now under the surface of any of the portions of
the streets or avenues discontinued or closed, or to elevate and carry
the same upon any of the viaducts or bridges, the plans of such
depression or elevation to be approved by the Board of Estimate and
Apportionment.

All works within, upon, or over the public streets and avenues are
subject to the supervision and inspection of the proper municipal
officer or officers, under such regulations as he or they may determine
and be authorized by law to impose; and the plans for the construction
of viaducts or bridges are to be approved by the Board of Estimate and
Apportionment.

The Companies are required to cede to the City of New York perpetual
easements for the right to continue and maintain the viaducts or bridges
over the streets and avenues, sufficient for their control by the City
for the purpose of police regulation and other control contemplated by
the City ordinances for the case of streets or highways; reserving,
however, the right to construct and maintain, at their own expense, such
connections between the viaducts or bridges and their property as shall
not interfere with the use of the viaducts or bridges for street
purposes.

The Companies are also required to cede to the City, grade and curb,
portions of five existing or proposed streets or avenues, and to pave
portions of two other avenues.