Or any tax strategies that I’m potentially missing out on by not setting it up in an LLC versus personal conventional mortgages?

One other thing to consider is tax implications if you sell. 

Stupidity tax. 

I also want to make sure tax wise I have the best structure possible. 

Hi Jacob - I have a network of partners from financing to tax strategy, REI coaching, etc...who can help answer a lot of these questions and get you some guidance. 

After subtracting all that from the 3333.00 , whats left is what you can spend on a mortgage payment including property tax, home insurance and mortgage insurance.

Bare minimum for me is $20,000 after a flip (before IRS taxes). 

a single family to a multifamily property is perfectly fine.Lastly to your question - You must purchase at least as much replacement investment real esate as you sold if you want to defer all tax.  

@Josh Roman I have one that’s two houses with three units on one tax parcel linked to a second tax parcel that has always been on one mortgage.

Same school district, property taxes etc.