Here is the cellar doors duty of property owners in NYC with respect to sidewalks and Lots:

Hardware defects which shall mean (i) hardware or other appurtenances not flush within 1/2″ of the sidewalk surface or (ii) cellar doors that deflect greater than one inch when walked on, are not skid resistant or are otherwise in a dangerous or unsafe condition.

Please check this Link for full New York City Administrative Code Sidewalk Rules.

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