By definition it is an offer of compensation in exchange for a suitable ready willing and able buyer (tenant).

Overseas you have currency exchange rates timing and other issues.

I'm new to real estate investing and I'm exploring the idea of using money that I have tied in a 401k retirement fund in exchange for an investment property.  

My plan is to purchase a few turnkey properties, use the cash flow to pay down their respective mortgages, then 1031 exchange them into a MFH complex.

Here you have a verbal contract for the exchange of her time for your money. 

I need to know before pursuing a 1031 exchange.

Imagine that they strike a deal with the next-door neighbor for an exchange - "you can use my pool if you fill my pool from your hose, with your landlord's money!"  

I'm willing to network and exchange info on the market with like minds.

In Long Island there are all kinds of companies leasing solar panels for exchange of buying electricity at a lower price from them.

You might want to consider investigating ability to get a portfolio loan on revised assessed value with a commercial lender or try a 1031 exchange on some of your initial properties to be able to accelerate your plan as you get into years 5+ of the journey.good luck!