He will pay me a small amount for the work im doing in the coming three months (tax free & legal because you are allowed to send someone a ''gift'' every year in the Netherlands).

Myself,  I'd look for opportunities to use it to build corporate good will, or rent to friends and family and actually show income even if I later gifted money back.  

I agree that multifamily investing is the easiest way to scale in real estate.

And you'll free up more cash because you can purchase the other properties with less down payment than you need to leave in equity for a refi.A little creative allocation of your cash proceeds can reap a lot of benefit for you in a multiple property 1031.I just got done with what should have been the easiest exchange ever, but didn't use Dave and had a pretty miserable experience.   

They were giving the journal as a free gift for becoming a pro member, which is how I got mine.

I originally wanted to take out the mortgage under my name using my investor's funds but, this doesn't seem possible without the investor having to pay the gift tax on the down payment when he gives it to me to invest.Any tips for how to structure this deal in order to move forward?

Doing that and just getting started by actually doing deals is the easiest way to learn.  

House Hacks are the easiest since you are usually finding properties that don't need a lot of work, putting only 5% down and then saving on living costs while building equity, cash flow and getting tax benefits. 

I’ve got “the gift” to speak to those on the other side, I’m hearing that he doesn’t want a bunch of crappy C class singles to be his legacy, he wants you to use it as a down payment on one big beautiful multifamily in a solid B area of Columbus, OH.

That's the easiest option.