I would like to branch into commercial leasing with a government client niche (solar farm land and datacenter leasing too).

Please do not act as an unlicensed manager, it will only result in issues for both you and your friend.

Some companies charge and some do not.

Maple Grove, STMA, Dayton but Dayton and Rogers are laggards in the school system where STMA and Maple Grove are literally famous school systems. 

If someone injures themselves and sues, they will be suing the LLC and not you personally.

They let it freeze and pipes break.

I’m going to lend  to a few people I know with LLC ‘s  on some mortgages and receive interest , I am not putting myself out to public lending just some commercial loans as LLC single member pass through  , do I have to pay local taxes in Florida , I have no brick and mortar , no employees , just LLC in Florida and live in Texas , there is no work involved I just receive interest .

I own my primary residence and want to build a DADU on the back of the lot.

And unless you go into some very rough areas, you won't find double digit cash returns.

@Sham Haile you should look up the Tenants Union & RHAWA websites to review the notices and requirements for how notices need to be provided to tenants when a seller intends to sell a property.