The last one was a single family home & took a week & $2200 in materials as a lot of the cast iron barely functional drains were also replaced. 

They will drain you.If you have any questions, or if you need someone to vent to, PM me. 

As indicated I would have welcomed the legal action if it were not for the time drain but the tenant wisely decided that they really did not need the "emotional support animal".If by some chance that I did lose the legal case, I would have made sure that their rent was always at the top of market rent while my usual MO is to allow existing tenants rents to get below market rent. 

For $6K, you should be able to replace all the supply lines in the house, plus some of the drain lines. 

So one of The Tell-Tale things to look for is where the down down drain it goes all the way into the basement at connection to the sewer and check those pipes for any type of leakage of rot.

Turning the water supply off and draining the lines reduces the risk even more.

The only lines they fill are the traps for the drains .

Don't believe anyone is insisting that a free and clear property will be draining your bank account month after month; it's more a matter of how you frame the argument.In regards to the original question; the value of property I own / the non-financed equity I have in those properties is about 5. 

They will look into the tank, surrounding area,  the diverter box for the drain field, etc. 

I have a landscape background so we wouldnt have an issue adjusting the grade to the house and tiering the back yard, adding drain tile etc if we decide to move forward.