What's the name of the position or person who can tell me exactly a price range for what areas of the duplex/triplex need to be fixed and how much they cost?)

The facts are rates are near a normal range on a 25-year average, with is around 5-6%.

I remember in 2003 when rates were in the 5-6-7% range, albeit with more aggressive mortgage terms available to almost any and all borrowers. 

I am looking at zip code 78229, and you can still get single family homes in the mid 200k range.

So takes 50 KW for 250 miles of range.. not sure on your lightning but the tesla you plug in and then program when to start charging. 

Likewise, in real estate there are Mentors by the dozen that all have “the secret to your success” available for purchase ranging from $289 to $50,000 (no joke on that upper number).  

The area is bound for a major makeover.

My realtor is showing me duplexes ranging from 399-430k.

However, Cape Coral, Fort Myers, and Lehigh Acres all offer multifamily inventory in comparable price ranges of single family homes in the other markets you mentioned, which will allow significantly higher cash flow potential

Houses that I've been looking at are $500 - $750K range.