Now that I know you are moving to Sosua, use Guido Perdomo or Guzman as a laywer, and let them check titles, etc... before you pay one dime...
If necessary place the money into an escrow account with one of them.
You need title (quite a lot of times dubious) and deslinde when you buy a property. Well, let me correct this, the seller needs these, but frequently they will want to use your money to pay for the deslinde, as it is quite expensive...
You also need to check if all outstanding bills (edenorte electricity, property taxes, etc...) are paid in full by the owner. If not, you will pay them before you get any service...
I am sure you already knew this, but just wanted to warn you, just in case...
A bit more money spent on a good laywer, at the purchase, could save you heaps afterwards...
Good luck
BelgianK