However, I also see how this could deteriorate into a lot of "did so, did not, did so, nuh uh" threads.What can and should we do to allow for leveraging our collective experience with these things?

The foundation of our fourplex has the eroding limestone and mortar issues, and it's time for us to re-enforce the existing basement walls and stop the deterioration.  

I had a plumber look at it and cleaned/re-caulked where the foam gasket completely deteriorated and replaced the broken shower handle for 320.Then the restoration guy came and did not detect any moisture in the garage wall or upstairs bathroom. 

Elements of it deteriorate and must be serviced or replaced periodically.

In other words, will the roof start leaking or will the sheathing around the house start deteriorating if the renovations aren't completed?  

I don't think I'd be able to get somebody else in there with the deteriorating condition of the place.

The western edge of Little Flower already seems as if it's deteriorating.

This begs the question, is the average BP investor jumping into a SFH investment because that is what is available to them based on capital, and if so, that's totally fine IMO... or is there a population of investors that fundamentally prefer buying SFH in deteriorating economic markets for short term cash flow over the longer term, risk adjusted growth of a successful syndication?

2) Purchase price $50,000, 10 of that allocated to the land. 30 years later, after allowing the building to deteriorate instead of maintaining it, you decide that you no longer want it to be a rental.

Would you say the neighborhood is gentrifying, stable or deteriorating?