I think this is a very bad idea. My personal experience and a legal opinion I read states that if you modify for additional dollars you could be in jepordy ofl losing your priority and becoming (possibly) an unsecured creditor. Furthermore, if you do a seperate additional note you could be in jepordy of allowing someone to "split your financing" and again be forced to act like a junior creditor to mechanics liens.There are reasons that construction is the riskiest loan you can do. If you want some more clarification you can write me back. I have worked with this before. The other thing to remember in construction is that if one mechanics lien gets in, they all get to jump in as a class. If doing a second note and mortgage, the money is well spent to get a junior title policy, besides, pass it on to the customer.
this is my opnion, not necessarily that of my employer.
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Luck is the collision of opportunity and preparation.