I think this might work if you are wanting to secure one loan by both properties, is to close the loan 5 days before the “purchase closing”, then after the rescission period expires you can fund both the loan and the closing. (The only problem is any last minute changes in the purcahse closing)
We do 2 separate loans, a lot easier and cleaner.
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The opinions expressed are mine and they are not to be taken as legal advice.