At this point, I'm not even sure what size facility to build.

@Mehreen ShehdadIt is impossible to answer the question as the amount of the HOA dues are specific to the complex and in most instances the size of the unit within that complex

Anthony, I don't think there is a standard "one size fits all" way to get started.

Given the evictions, I would definitely screen very thoroughly and check everything.  

I would call the lesser qualified tenant and tell her that you had received the other very strong application first and see if she still wants to risk her cash in the screening process.I often may receive several applications in a day and run the screening that evening.

The condition of the house, the property size, location, age of the house, finish work, etc. all weigh in to valuations.

A tenant in a ground floor unit reached out over this past week asking if I would install a screen door as "the previous landlord had promised to put one in". 

I think it's still the case here in Charleston County that you can add an accessory dwelling of up to 800 sqft as long as your lot meets certain minimum lot size requirements.  

They apply and everything goes through as far as screening and we sign the lease and received the security deposit with the plan to move in March 1st.  

Screen, screen, screen and don't ever compromise just to get the rent checks rolling in.