She had people there doing drugs and all these kids running and out of control .

This will require a lot of physical work to put in the water and septic systems, but cost can be controlled if you do it your self. 

Although there are circumstances going on at the moment that are out of anyone's control, generally, it's not difficult to avoid evictions; thoroughly screen, invest in a quality market and treat tenants like human beings.

Now that we are here other than protesting the government actions what else can we do to take control of our REI businesses.

There is also a big difference between condo rent and SFR rent in most areas, so I'm not sure where exactly you're looking but be sure you're comparing as accurately as possible.Los Angeles city rent control is different than the statewide rent control so that is something to consider, also there aren't a ton of reasons you want someone evicted if they are paying the rent and are abiding by the lease. 

But once my nephew and I got control of the property as possible buyers, I thought I could easily set up 3 RV's.

I would need proof of the lump sum payment at 18 years old and proof that she has control of the funds.  

Please find me two economists that agree on much of anything, except that rent control is generally bad. 

For my rent controlled tenants I must spell out the entire formula and cite the municipal code an then show the math.

Maybe look into Checkbook Control.