I had perceived the original comment as slightly insulting.

They are perceived as investors and don't market themselves as agents/brokers.

The trade off is impressing the unknowing who may worship that perceived success but there are always others in competition.

Furthermore, the expectation of large price increases may have a strong impact on demand if people think that home prices are very unlikely to fall, and certainly not likely to fall for long, so that there is little perceived risk associated with an investment in a home..."

A fireplace adds instant charm & perceived value and you can tout that as an energy saver.

I understand the dilemma you perceive yourself to be in, but you have no responsibility towards anyone other than as a landlord and as required by law.

Fencing would be a good #2, more so for the perceived value by the owner/tenant; it's actual effectiveness is pretty much nil unless you are spending big $$$ for steel bars all the way around.

Fear is based on risk...perceived or real, and can only be combated by risk controls. 

It could be their perceived comfort and trust in you.

Low price markets are low priced either because they are perceived to have low appreciation outlook or are perceived to be high risk.You did not indicate when you purchased the OOS 5 units, but I suspect if it was at least 5 years ago that the San Diego RE cost to current rent ratio would be better than your OOS property implying likely better cash flow for the San Diego property.Good luck