Maybe they are bad communicators.Assuming you still want the place, I would do anything you want to reach out via the renal address or professional websites, but home addresses and personal social media is going too far.

Best bet is likely (not absolute - everyone's situation is different) is to look at a national lender or broker that has options in lots of states - its a great development versus 20 odd years ago, with technology, internet, places like this - can have access to many more options than before (local broker or lender thats it)

If he's he only one in the area, you could try to do it yourself by making everything automated (such as e-locks, internet, security, laundry, etc.) 

Social media has really messed it up for my generation.

Typical on the Internet though.

To gain investor confidence, ensure the investment property numbers are real, use the most common contract forms in your state (versus a 2 or 3-page) internet/guru contract form) with appropriate addenda, or an attorney-drafted form and attorney-drafted assignment agreement.

Can any of you make some recommendations on how we can install cameras without possibly having to use an internet network?

There are a lot of shiny internet companies touting their HELOC, but you will do better with a local bank every time.

Also do not take documents off the internet, get an attorney to draft documents for you and also always close with a title company. 

My acknowledgement of investors seeming happy was based on internet discovery.