I've found the adhesive doesn't bond well to leveling compound although I haven't had any tiles come loose.

There can be many residual claims from long lost family members so just getting the right person to sign is impossible.Taxes on income, property taxes and capital gains if they have that idea.Rental laws.

If there are pipes coming in through the floor, I patch the holes with a pair of sissors, flashing and some construction adhesive.

Still waiting for my residual checks from that.

You would abandon any residual value of any improvement made, not a smart way to go usually, but it depends on what improvement you built.

If you are familiar with Dave Ramsey this is what he calls the debt snowball. 2)  If your parents want to get out of maintenance issues they can sell each house in item 1 with owner financing as it is paid off, they will have residual income but no longer be on the hook for maintenance.  

So, the risk of holding on to it for that eventual increase in residual value is probably about $6000 to $8000 per year.

I had such a good residual income coming in during the middle 80's because I got creative and made deals. work..99% of agents would say hey I need to be paid at closing I cant take commission over time, Me I just banked these to the point were my residual income was ridiculous..

There are factoring companies that purchase equipment and lease back or lease it to a lessee providing residuals for the future sale of assets as well.

I made a mistake buying a german SUV bought new in 2003, which now has a residual value of 10% 11 years later.