They actually called me cause I put a for sale sign in the yard to get a response and it worked.

One just about totaled the house, car left the road, at 4 AM and went through the concrete foundation and ended up in the basement, causing severe structural damage. 

Again - if you don't own the property, you tend to treat it differently.Finally, some HOAs have gone to an HOA security deposit system to ensure damages to common areas are paid if caused by renters.Not intended to be legal advice but just commenting as to my experience.

Once REI becomes "cool" and "hip" again, the people who don't know what the heck they're doing will come in and drive the prices up, over-inflate the market again, and cause another crash (even if its not as bad as the last one). 

If they are lower then you might help them or cause your tenants to move.You might also consider splitting off the MHP from the house and studio.

In this case its 3, 4, 5 days per week, or another way to look at it he is there at least half the time.My issue is first he is not screened, he has a key, he is using water which I pay for, and his car occasionally causes parking space congestion.I am going to have a talk with my tenant about this, but there is nothing in the lease that prohibits this.  

Clearly if something went wrong, it would cause friction and awkwardness.  

Also, based on my background the autistic child could be a cause of the noise.

There is no harm it getting someone to help you "find" that property as long as you are truly interested in "buying". 

Many people must have been on pot or LSD or something back in the 60s and 70s when this stuff was being used a lot cause it sure is ugly.