Must I fill out all these forms just to change the name of my Deed? Deactivate your EIN.These are documents and forms relating to the areas in which they are located. Most documents and forms on this website are in Adobe Acrobat (. Exemption applications must be filed with your local assessor's office. See our Municipal Profiles for your local assessor's mailing address. Do you want to pay lower property taxes on Long Island? With over 30 years of experience, let Maidenbaum file your Nassau County tax grievance. The application must be filed no later than ten years after the levy of taxes upon the assessment roll on which the renounced exemption appears. Federal Tax ID Number: 59-1863042.