Also consider when you sell house with seller financing to owner occupied person as their primary residence you cannot balloon per Dodd Frank.  

The projects discussed on this string are from a previous company called Financial Attunement, where Neal was a junior partner, and a senior partner was CEO of that company and primary decision-maker.

His REI is an after fact, the hopeium sales are primary.

I think I've bought 10 houses (primaries and investments), and I've had that same "Oh crap, my chest hurts, why did I think this was a good idea?"

It starts slapping and bouncing around wildly and more often than not, gets further away from the water as it probably thinks its being successful in getting away, have you seen that before?

Take the $250,000 primary residence exclusion every two years .  

I’d like to buy the place, renovate it, and then live in it for a few years as my primary while renting out the 2/1, and then ultimately selling or renting out the main house too. wondering what the best purchase strategy would be considering I don’t have the full purchase price in cash on hand?

It's going to be more about your confidence in the market that you can afford than anything else, so the primary thing is to look up a few areas you might be able to afford and then look for someone local that can hop on a call to give you an idea about what investing there is like. 

I have two real estate property as rental, 3rd one is my primary all based in San Diego.

If so you may have some full doc options which have the best rates typically and terms.Like others have mentioned you have DSCR loans too but this only allows you to purchase non owner occupied properties (not primary residence or second home occupancy type properties).