Section 279. Subdivision review; record of plats

1. Filing of plat with
  county clerk or register. (a) No plat of a subdivision of  land  showing
  lots,  blocks  or sites, shall be filed or recorded in the office of the
  county clerk or register until it has been approved by a planning  board
  which  has  been empowered to approve such plats. Further, such approval
  must be endorsed in writing on the plat in such manner as  the  planning
  board may designate.
    (b)  Such  endorsement shall stipulate that the plat does not conflict
  with the county official map, where one exists, or, in cases where plats
  do front on or have access to or  are  otherwise  related  to  roads  or
  drainage  systems  shown  on the county official map, that such plat has
  been approved in the manner specified by subdivision two of section  two
  hundred thirty-nine-f of the general municipal law.
    2. Notification of filing. It shall be the duty of the county clerk or
  register  to  notify  the planning board in writing within three days of
  the filing or recording of any plat approved  by  such  planning  board,
  identifying  such  plat  by  its title, date of filing or recording, and
  official file number.
    3. Effect of filing. After  such  plat  is  approved  and  filed,  the
  streets,  highways  and  parks  shown on such plat shall be and become a
  part of the official map or plan of the town.
    4. Cession or dedication  of  streets,  highways  or  parks.  (a)  All
  streets, highways or parks shown on a filed or recorded plat are offered
  for  dedication  to the public unless the owner of the affected land, or
  the owner's agent, makes a notation on the plat to the contrary prior to
  final plat approval. Any street, highway or park shown  on  a  filed  or
  recorded  plat  shall  be deemed to be private until such time as it has
  been formally accepted by a resolution of the local legislative body, or
  until it has been condemned by the town for  use  as  a  public  street,
  highway or park.
    (b)  In  the  event  that  such approved plat is not filed or recorded
  prior to the expiration date of the plat approval as provided in section
  two hundred seventy-six of this article, then such offer  of  dedication
  shall  be  deemed to be invalid, void and of no effect on and after such
  expiration date.