An additional benefit of a detailed engineering-based Cost Segregation Study is that it can increase potential insurance premium savings as well as provides support for the property tax appeals process.

Knowing what I don't know I hired a reputable civil engineering firm to handle my site plan.

(they've also recently upgraded their algorithm to something they call HPL- we had to change over, so if you haven't done so, check that.

Bridge financing(interest only):For construction loans, you could do a bridge solution to help you buy the land and do the vertical construction(get the land surface engineered and developed for putting up the apartment buildings) and then horizontal- downpayment will vary.

1 - What does it cost to buy a car with 4 wheels, a big engine, nothing fancy, in Atlanta, GA? 

Since this was out of my experience I hired a "Structural Engineer" to replace all of the rotted out studs, reframe the wall, and a few other things.

I am still developing a strategy but I would like to rent out a place that me and my family would feel comfortable living in ourselves.For work, I am an AI analyst for the Army Corps of Engineers.

Another option is to find a good local architect, civil engineer, or similiar third party consultant to take a look at it and let you know their thoughts on the viability of developing it. 

That's how you decide if the project is worth doing before you start spending money on architects, engineers, city fees, etc....Or you could spend $30k to get your plans stamped and then run the numbers and find out you can't afford to do it....Just curious....how much are your architect and engineering fees?

The very first thing to do is to do an 'Engineering Based Cost Segregation' study performed to see where you can get back some serious money, using your rentals, to get back some serious money from the IRS.