I am not saying Belair Edison is right for you, but if you know it well it will give you a standard by which to judge.

Hello biggerpockets,I am trying to understand all the potential *legal* issues I can run into by trying to split a regular single family home that is zoned as such into essentially a duplex with 2 separate tenants, one living in the house and the other in the basement.

If you're living in one of the units you're likely able to insure the property on a standard homeowners policy with some added endorsements. 

You need to understand the tax regulations on both sides of the boarder.

I understand I cannot look back, but my experience creates a lower-risk profile for investing out of my local area than a true newbie investor. 

Understanding taxes is a weak point of mine that I'm trying to fix.  

I understand that there will be impact to the compounding of the TSP funds that I pull out for the loan, but I am speculating if I can buy the right real estate deal, it may offset that impact and get me on the path to accumulating more real estate via BRRRR that will more than compensate in the long term.This would be a general loan from my TSP to fund the down payment for the bigger loan to buy the property .Has anybody had either good or bad experience with this?

I only mentioned it to her casually and I don't think she fully understand. 

Completely updated the interior of the home and made it to market standard.

If you decide to go directly to the listing agent you should understand Dual Agency.