Your loan doesn't seem like a bridge loan to me, as it isn't financing the purchase of their new primary residence. The primary source of repayment seems to be selling the home after making the improvements (even the caveat of renewing/modifying wouldn't be helpful, as it seems the plan would simply be to renew until it DID sell); i'd be inclined to report it.
We no longer escrow, so i'm afraid i can't help you with the short-term loan escrow question.
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I'm fixin' to fix that.