You'll need a letter from the leasing company giving you permission to register the vehicle in NY, a power of attorney from the leasing company that authorizes you to register the vehicle, and the signature of the leasing company officer in box 3 on the Vehicle Registration/Title Application or on the Registration Authorization.
I don't think I paid sales tax for all of the lease payments. What do I do?
The process will be the same as if you hadn't paid any sales tax at all. You'll have to provide DMV with your lease agreement and fill out a Statement of Transaction at NY State Department of Tax and Finance. The sales tax for any existing lease payments you have will be paid to DMV.
Can this be done online?