When I purchased the apartment in which I had been living for three years, the payment was easy. The seller lived in New Jersey, so I processed a transfer from my Massachusetts account to her New Jersey account before closing day. The seller confirmed the money was in her account at closing. My escribana had the documents prepared and I paid her fee in pesos. The entire transaction took no more than fifteen minutes.
If you are fortunate to find a property owner with a US bank account, the process is simplified.