At any time following approval of development plans, including the issuance
of permits for any part thereof, the applicant may petition for review in
detail of the previously approved plan, stating his reasons therefor. Such
reasons may be based upon such considerations as, but not limited to, changing
social or economic conditions, suggested improvements to layout or design
features or unforseen difficulties or advantages, such as site conditions,
state or federal projects or statutory changes, which may mutually affect
the interests of the applicant and the Town. The Planning Board, upon finding
that such petition and reasons are reasonable and valid, may reconsider the
design of the planned unit development and shall follow, in full, the procedure
and conditions herein required for original submittal.