The only solution I see is connecting them to city sewer which won't work 95% of the time. 

Private lenders or even creating a small syndicate with a group of investors might also be worth exploring, especially since you can point to your uncle’s track record and your own experience managing rentals as a selling point.If timing is tight, you could look into a bridge loan to secure the property while figuring out a more permanent solution.

Quote from @Jeffrey Mair: Hello, I am seeking advice or creative ideas to move closer to the goal of owning a home in San Diego county without the obvious solution of selling off my small rental portfolio.

Changing PMs is probably not the solution to your problem, and will likely create other problems. 

I was wondering if a manufactured home would be an economical and profitable solution. 

If those are relatively modern you have very little to worry about.

Also be open to knowing that you are acquiring a series of problems.You're in the solution business. 

It's a simple solution, get more info.

Understand, real estate may not be the solution you are looking for.

Most are going to want to lend on the rehab as it ensures the rehab to be completed,There are numerous ways to pencil it out in your favor though.It benefits to work with an experienced broker who can guide you through the process and put you into the best possible product and solution out there for you.