A NYS TP-584 form is required to record a boundary line agreement. ​ RP-5217 and NYC RPT forms are not required.Use this boundary line agreement template to create a legal document to establish boundary lines between properties. Complete and sign online with PandaDoc. You may use them to apply for permits through our Online Permit Center. This is how to easily fill out Boundary Line Agreement (Short Form) in 2025. Visit our homepage and click Sign up to create a new profile. A boundary line agreement is a legally binding document that sets clear boundaries between neighboring properties, providing certainty and preventing conflicts. My advice would be to have him sign the affidavit and attach a copy of the new survey confirming that those are the proper boundary lines. To have the line adjusted, the neighbors must file an application with the planning authority and pay a small fee.