Luckily we live in a business friendly state that makes this information accessible for the researched business owner.

However, everything I read about making a basement livable space says ceilings need to be 6'8 and now lower than 6'4 at the beams. 

This usually keeps it to where your tenant is only technically renting their room and has common area access to the rest of the house.

Do you have enough capital to break into the multi space?

Intent is to live in the largest area of the house, rent an already existing basement apartment on short term rental, add a bathroom and kitchenette to two finished rooms in the garage and create a second short term rental, and then put a yurt in the back yard with sole access to another bathroom that'd be installed in the garage as another STR. 

An empty retail box may be unoccupied for a long period of time, and to the general public it may look as if it's abandoned, but often the deals to fill these spaces can take a long time to complete.

My brother thinks we have to help and when I explained him this, that I “didnt“ want to help at least right now he told me how cam you be so selfish you can do whathever you want but if you dont help you are dead to me.I just dont understand how they dont see that the best option is to buy a house in order to rent some space!

Decide how much money you have access to, & the zip codes, city or state you want to focus on.

How do I get access to land/lot public records like these?

But I am definitely not big enough to run with the big dogs.My challenge is that I feel stuck in this middle space.