We are not allowed to post phone numbers here, on in the market place. 

In fact, I was just on the phone with the housing agency yesterday because they haven’t paid the rent since the tenant moved in at the end of January.  

Is this at all common in single family investing outside the turnkey business model?

It's not likely you'll get caught, but it's worth pointing out.If you haven't already you can install autolocks door knobs and automatic door closures on common areas.

Transferring title like this is common. 

(obviously my mistake) So 2nd time almost identical issue, on the 5th tenant came by after hrs with no phone call or acknowledgement that they had left payment except this time we saw the car leaving so i called (of course no answer) but left a very stern and detailed message about how this was not acceptable and no longer will be tolerated. 

Are there common areas, where the owner is responsible for?

Technology advancements such as email, phone calls, skype has enabled communication with a remote CPA to be seamless.

(This is common with listings that are not in your geographic area, outside your area of expertise (i.e. commercial), or whatever).If the seller is represented by a broker, and you refer a buyer to their agent/broker, you would normally ask for a referral fee from that broker (this is less common: because why wouldn't you just rep the buyer and take the full commission?).

California courts have a legal process whereby the court can force a sale of co-owned property where the cotenants are disputing (common in divorces and family disputes with co-owned property).