But with only a dozen properties in only 2 states I’ve definitely not found a use for one yet.

They apparently don't use title and I do have one. 

Includes a single family home (4 br) which was divided in two sections one of which is being rented.

One I know is based in LA as that's a huge market of course..

A few other houses (all single family houses) on the same street are on the market for rental and they (including my house) all get grouped and nestled under one cover listing as “units” of an apartment complex.

It’s a newly renovated 3-bedroom, 2-bathroom home, just one block from the ski slopes and four blocks from downtown.The current owner has been renting it out for $30,000 per month during the peak winter and summer seasons.

We have one rental property in Frederick MD and are investing out of state.

I've separated out electricity but not water (never heard of sewer being separated) and I've always had separate gas meters on my properties but have separated the heating system on one.

One note on this @Jenny Yu. 

The property, though is not beach front, nor does it has ocean view, is just a short drive from some of the best beaches in the west, which are great for surfing, snorkeling, SCUBA diving.In the 1.21 acres there is a main single family home (4 br) which was divided in two sections one of which is being rented.