I think HELOCs don't have that same restriction, or do they?

If you are interested in notes and loans, why not just invest in a note with your SD IRA vs buying a piece of real estate, and all of the headaches, restrictions, taxes on leverage, etc that come with buying RE with SD IRA?

I would love to get a quad in my working class neighborhood, Lincoln Heights, on an FHA loan.  

On a big enough project, TIF can be part of the package sold to the lender to fund the remainder, but if you're talking coming with no funds, TIF is usually restricted to public or quasi-public goods - i.e. fixing streets, sidewalks, upgrading water lines, building facades, etc.

I have a property under contract and it is in the prime location of Seminole Heights in Tampa, FL.

. - I am also looking to do the same in the BedStuy, Bushwick, Crown Heights areas in Brooklyn - with the exception of renovating as I do not have the skillset or time. 

Read the restrictions of the HOA, generally hate condos and Town homes w hoas 

Getting a commercial loan as residential lenders have tighter restrictions with seller financing in place, haven't found a bank yet who can do loans with seller financing on a traditional bank loan, have shopped over 20 lending options. 

Will there be any rental increase restrictions for same renters if they want to continue after ending current lease time.2.

Even if they are still within code for height, they may not be for uniformity.