I think you need more information on what the plans for the current "home" are. I don't think the future construction matters unless your current loan somehow funds it. If the current structure will be used as a home, or held for sale, i'd report it. If they plan to tear it down (i'd want a little more than "we MIGHT tear it down"), use it for storage, etc.......i wouldn't report.
This has been a hot topic over the last few years (the look-forward or look-back thing i guess you'd call it), so if you want support for the opposite view, i'm sure you'll get it.
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I'm fixin' to fix that.