Just remember liens are different from state to state. I spent 5 years practicing construction law primarily in Wisconsin but some in Illinois as well and the only thing for certain is rules are different everywhere.
In most states the interest rate is set by the state in a statute, you can't charge whatever you want. I'm surprised Michigan lets you assign your own rate to a legal document. Contractually you can usually charge whatever you want, but once it turns into a lien, you get the same rate as everyone else.
Second, Ezra, I wouldn't bother with a lien if you are sure that the mortgage is higher than the value of all of the assets and the estate. You can't squeeze money out of a turnip, and you will be the last in line. If you think there may be money AFTER everyone else is paid, then file a lien and become a creditor in probate. It should only cost a couple hundred bucks to file and then you should get all the paperwork and determine if you want to pay a little more later in the game to protect your investment.
Prider1-
I think you should check into your lien a little. A few big things don't add up. 1) A lien should have been converted to a court judgement long before 11 years (most liens "expire" if no further action is taken). 2) Like I said above the interest rate is goofy. 3) Even if you have converted it to a judgement, the statute of limitations has likely run on the judgement unless you have taken some further actions
As long as you aren't really counting on the money coming in some day, your fine. But if you need the money back, I'd do some checking asap to make sure your rights are still protected and haven't expired. A couple "highly reliable" (sorry I don't have access to my legal research tools any more) sources kind of verify what I am syaing:
http://constructionliens.uslegal.com/state-laws/michigan-construction-lien-law/
Good luck everyone. Sometimes getting paid is a b*tch.
Blutooth