If they want to remain tenants there then they should be required to pay a normal rent.

If not, move on to something that fits your personality and beliefs.Whether you remain one of the 90% that just talk about real estate or the 10% that get off their asses and do something, the only difference is taking action.

My leases follow the Colorado Residential Lease Agreement template on the State website which doesn't list a fee, it simply states, In the event that any payment required to be paid by Tenant hereunder is not made within three (3) days of when due, Tenant shall pay to Landlord, in addition to such payment or other charges due hereunder, a "late fee" in the amount of ____ dollars ($__) In my leases, I charge "10% of the regular monthly rent, with an additional late fee of $3.00 per day being imposed for each additional day that the full amount of the monthly rent remains unpaid."

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At this point there is nothing else I can do personally while remaining a "good neighbor".

Currently I am in the process of paying remaining $1500000 that might take years.

But the mindset remains that the structure just loses its value over time.That's not to say I think property investing in Japan cannot work -- it's just the parameters are quite different from places like the US (like many things in Japan!).

How are they going to come up with the $60K ($170K-$110K remaining on the mortgage) difference?

Quote from @Brett Deas: I personally don't like using furnished finders accessory systems as they have big holes in them, but one thing I have learned is they are a travel medical professional you can ask to see their contract.

Keep in mind the money remains the property of the father.