Steve, I was just at afip last week. This is what the representative told me you must have for your CDI:Original passport plus a copy for them to keepCertificado de domicilio for the police station federal that corresponds to your addressForm 663 completed for themNow, she didn't mention the lease - your cert dom is supposed to surpass that because it's an official document, also nothing that has an address with you name on it either, but it certainly doesn't hurt. make sure you take an extra copy of everything and make it nice and neat, make their life easier and don't go too late. I know the office on Luis M Campos opens at 10, I would suggest if your office opens around the same time you don't get there too late either and make sure you take the correct number as soon as you enter the building (and bring something good to read while you wait!)Regarding buying the car, you can buy a car without a visa here. You will need your passport and your CDI. For all the paperwork you can hire a gestore to take care of the registration. I have several websites you can check where you can find private and dealerships. Be careful who you buy from and do NOT use Car One, they are overpriced. Oh, and be ready to pay a lot more for the car here than in the States or elsewhere. email me if you want the sites at movingtoargentina@gmail.com