I'm using an FHA because it's an assumption loan and I'm getting a very favorable rate so I thought this would be better than using a conventional loan which at the current rate environment would be more than double the rate on the assumption. 

Simply put, you want 200k for lowballing the seller and finding a buyer but you think a flipper spending 2.1M total and taking on over a 6 month project only wants double?

He would charge a double digit interest rate.

Most title companies won't do "double closings", but they will do wholesale fee closings.

Avoid paying double closing costs if you can. 

But thats a win in my book given that supply of STRs has more than doubled over the last 2 years in Coachella. 

The BP books are pretty good, but what worked best for me was listening to the podcast on double speed and learning how investors talk and think.

If it wasn’t disregarded you’d pay double the income taxes.

I'm looking for a sponsor that has been in a market for ideally 10+ years, has had multiple exits, and has not doubled down in the last 3 years.

It will have total costs approaching double that price unless you are planning on doing a significant amount of the work yourself.