I think just about everyone you speak with is having this issue. I know for a fact that Compliance One Mortgage and Encompass will not properly handle these transactions unless you do 2 separate transactions, 1 for the purchase and another one for the construction.
As for as I'm concerned the software companies completely failed on this, as did the CFPB for their lack of guidance.
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The opinions expressed are mine and they are not to be taken as legal advice.