The following are the usual documents you need to comply:
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Tax Identification Number (TIN)
Photocopy of 2 Valid IDs / Passport
Reservation Agreement with your Signature (provided by the seller)
Filled up Buyer's Information Sheet (provided by the seller)
* If you don't have a TIN, most Sellers will apply for a TIN prior to transferring the Title. Make sure to ask the Seller if they will do this (each one is different).