I hope this helps a tiny bit.  :-)Good luck! 

Based on your numbers provided, you should sell now at $600k and walk away with a tiny profit or break even.

( If utilities get very high due to studio use I have asked studio apartment to chip in to help w/ front house a couple times)

I am calling tiny brokerages fly-by-night; the new agent is just green.

But that is where I would start.. then from there trying to find a second in this scenario is probably a waste of time and another partner same thing whats in it for them.. so either you guys all chip in with cash or you go hat in hand to senior lender and work a deal.

Also, it may be a useful as a threat/bargaining chip your attorney can use so I would not file until you talk to the attorney.

The building can be a stick build or prefab modular or something off the wall like a Tiny House, etc.

Maybe I just operate in a non nanny state where it's assumed parents will keep their kids from eating paint chips

But that's only here in my tiny part of the world.

I didn't feel right to make an offer that high.  330K for a tiny 1bed, 1 bath with loft cabin.