I have deep local knowledge of these 3 markets, I have family connections to a licensed contractor in Hawaii and San Diego, and I am a professional at digital marketing and advertising, specifically on Facebook. 

You are in a market where the median home price is probably in the 7 digits and this industry is commission based.

This is the downside to digital forums vs over pizza/burgers.

I was thinking some sort of digital approach, more so social media than SEO, but thats something I'll consider nonetheless.

I am not comfortable with him continuing to live in the building and am concerned about the safety of the other tenants as well as myself.

In the second case, those two offers will be extremely stressful.True hoarders see value in every possession they have, often valuing their stuff more than own health/safety/comfort. 

I simply verify they are still employed via a quick call to their HR/supervisor so I know they're not creating a smoke screen about their ability to pay, then I send them the PDF addendum to sign digitally. 

Go direct to your local building and safety office (LADBS) and inquire with them.

In lower risk assets, investors are willing to pay more money for safety, so as they bid up the price, the cap rate is lower in the lower risk assets.Its helpful to think about it in terms of bonds.A 2 year treasury is lower risk than a 30 year treasury, so under normal conditions the yield on the 2 year bond is lower than a 30 year bond. 

I typically look for trends in total population, jobs, household income, unemployment rate, safety ratings, school data, general news, and fiscal policy / public initiatives.