If you have not been paid by a contractor or subcontractor as agreed upon for doing a public improvement project with a mayoral New York City agency, you may file a notice of lien for the value of the labor and materials against them. When a lien has been filed, the Department of Finance (Finance) will withhold one and one half times the stated value of the lien from the City's payments to the contractor for 1 year. At the end of 1 year, the lien will expire unless it is extended by filing a Notice of Extension.
You may file a notice of lien after you have provided the labor or materials. You have 30 days from the time the project is accepted by the mayoral agency - regardless of when your work was finished - to file your Mechanic's Lien on a public project in New York City.
Authorities such as Transit, Housing, and School Construction handle their own liens. You should file the appropriate documents directly with them.