Cost to foreclose on non-performing note...

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I've been presented an opportunity to purchase 12 non-performing notes for some duplexes.  My question is what could I anticipate the cost being to foreclose on these notes?  They are individual loans but are all owned by the same owner.  I would anticipate he would fight them best he could, and draw it out as long as possible.  He filed bankruptcy in the past and these notes were restructured at that time.