Sure Yusuf, that's a very tried and true method of real estate investing that has done wonders for a lot of people.

I want to leave the method ( flip, brrrr, buy and hold, ect...) open to the specific property and circumstances. 

I want to make sure I have current info.As the title said I am looking for the best method of converting my 401K for Real Estate investing, SDIRA LLC, Texas SDIRA Series LLC or Solo 401K.From everything I have read I am leaning toward the Series LLC but it seems the Solo 401K has some advantages although I am not sure about liability protection. 

Ultimately you're solving problems in real estate and if the difference of market rent to his rent is XYZ$, then decrease that from the purchase price. 

I have an investor I'm working with to help locate a property to use the BRRRR method.

If your ultimate goal is to build a portfolio then the BRRRR method is the way to go.

@Daniel O'Neil the risks involved with the BRRRR method depend on how much capital you have.

I still consider myself relatively new to this, but I would have bought using the BRRRR method sooner than I did.

I was wondering if I should look for a duplex that has a master meter and a sub-meter, or split the utility bill in half, or implement the RUBS method....

Or is this a problem that a professional installer might be able to solve?