So I own 4 rentals, but only 1 storage unit.

You can invest in retail, industrial, multifamily, office space, self-storage, and more.

I have been buying apartments, self storage, and a couple SFH, along with a strip mall and they have helped me close on all of them.

While browsing listing at some of the websites, I came across Self Storage units, Campgrounds, RV Parks and Mobile Home Parks.Some of these seem to be pretty reasonably priced compared to multi family rentals.

It’s a plug-in device in an open window.

We have a self storage facility with multiple apartments where we cover the electric (due to certain constraints).

I'm thinking if the following will work:Set my first LLC (the one that already has a registered agent) as the registered agent of all the other LLCs - that way, any mail coming in will go to the RA service (under the name of the first LLC and the address of the RA service), and they will process and upload it to the online storage. 

It can take 3-5 years to get a project built and stabilized depending on size. 2-3 for 20-50 units.Small commercial and self storage are making a lot more sense in several markets right now as apposed to apartments.Development is risky and there are a lot of moving parts so you really need to study this and hire a consultant to help you if you have never developed ground up.

In fact, you raised up more questions which I haven't done that is, one of the properties was 15 acres of land, no houses to my knowledge on it, do I still have to keep that mowed and the next one is a lot in a sub-division with 1 bldg, possibly a storage unit, no house.

My PITI is $790 a month and my rent in the other half is $805 (750 plus a yard maintenance fee and storage closet fee).