You said there is no appreciation in site, I think it would be better to find a multi family in the "path of progress" or even in a better area that will be stable, with potential upside, as opposed to this deal that seems mostly negative.  

I’ve found a few good articles on Bigger Pockets – but honestly it seems like there is way too much information on this site to shift through6.

@Paul StewartNothing complicated about it.

But, don't forget if you do let him go, look at his completed work and see if he is willing to provide a guarantee or warranty.I will be remiss if I do not mention that this situation can get quite complicated.

It is complicated. 

I am new to actively engaging the site.

FOUND SOLUTIONS:1 - This looked relatively inexpensive, but requires a window in the basement (which may not be present), and is very much DIY:https://www.finehomebuilding.com/2008/09/10/a-dehu...I found 2 - 5 on the following site:  https://www.hunker.com/12002792/how-to-dehumidify-...2 - Placing Charcoal bricks around the basement3 - Filling a bin with rock salt and drilling a few holes allowing for water to drain4 - Buying desiccant's and placing those around the basement5 - Running an electric heater, set no higher than 95 degrees.I really like option 1... but if my basement doesn't have a window, it won't work...

Is there sites/apps I can use to get more info?

I am seeing a lot of CA folks on this site. 

I have learned so much in a short period of time on this site and there seem to be quite a few other ROC investors here as well.