I agree - if you do not mandate a specified 3rd party, it's not a required svce. provider under RESPA. Even if that party is the only game in town (small town, only one attorney, for example), if you are willing to accept any qualified party, it's not a required svce. provider needing disclosure.
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I disbelieved what he was saying so hard, I probably created an alternate universe where it wasn't true.