One of my rentals is on septic, and I have had problems with roots down there.I know very little about what piping and installation cost as I have never had to replace pipes in a property before.I am curious if the BiggerPockets community believes my plumber's quote below is reasonable or what questions you would need answered to understand if this quote is reasonable. 

Hey guys, I have a Detroit rental property that has tree roots in the storm and sanitary and both are trapped.

Replace all TCs, drain water, add chemicals in all toilets to kill roots in the system.

Times have changed, and there is a great misalignment of interest in the landlord industry with that of the investor, but if you look closely enough, you will find that the roots run deep, and straight to our friend Jesus

But she said the seeds for the current lack of housing took root long ago, and more than one kind of garden tool will be needed to dig them out.

We're rooting for ya! 

I do notice what appear to be some roots coming out of the opening on the right side

I am rooting for you to succeed. 

Someone needs to wash the sheets, towels, stock the shampoo, conditioner, soap.

Them not being responsive is another problem and should absolutely be addressed with the broker/owner of the company.From your comments you definitely do not need to be managing this yourself but think twice before letting others convince you that the PM is the root of all your problems.To answer your questions:Leases run with the land meaning the same lease stays in effect no matter whose name is listed as the landlord between management transfers or even a sale.