These are typically ownership groups, not single owner.  

However, not one general location is going to help you determine whether it's a good market for multi family or single family etc.The one true way to start looking into a market is talking to an agent who knows the area.

I understand I can increase liability in each individual landlord policy, but one single umbrella policy is much more cost effective when I have multiple properties.

I don't know a single broker who would allow an agent to wholesale while hanging their license at their firm. 

I worked for a bar company and we went around grabbing beat up spaces and turning them into hot nightclubs. 

Unfortunately, it cannot be used for a 2-4 family property, only single family properties. 

I have 8 single family rentals in 2 single member/pass through entity LLC's. 2 states.

The area’s limited number of apartment buildings means that many renters prefer single-family properties, creating steady demand for these homes.Happy to chat further if needed.

My suggestion if your goal is to free up some equity to use for another purchase - start small with the single family home with a cash out refinance.

We came across a large single-family residence with two kitchens, right next to a commercial zone, that was previously used as a sober living facility.