The way I'm looking at it, if my spouse and I only do employer matching for the 10 years we would have more than enough in there and still 10 years out from being able to access it.I do plan on doing 401k loans for deals if the numbers check out, and I've considered rolling over some of our 401ks into roth IRAs to access our contributions but we'd have to pay taxes out of pocket (a big hit to cash flow) and we couldn't touch it for 5 years.  

However, good asset protection planning starts before one has significant assets to protect.  

I would consider selling if you have lived in the home the past 2 / 5 years since you have a decent amount of tax free equity in there but as long as you have a plan to reinvest those funds.By your numbers, since you have an amazing rate and high rents, I would consider renting it out if you believe your area will continue to grow in value.

The sellers plans to exchange will not affect you or the terms of the sale.

How long are you planning to do this approach?

Sometimes the tenants plan on paying a month's rent at two places to allow a less-hectic move. 

When you are getting into raising big dollars from sophisticated investors they are going to want to see a track record and a well thought out and detailed business plan.

Best wishes on your plans!

Got divorced at that time which threw a wrench into plans so rental was put on a backburner.

I am considering moving back as I have family there and if so would plan to look for fix-n-flips to invest in.