Using 401k to buy multi portfolio.

[Travis Darden]

BP members,

Looking for some advice.  Have one rental that has been successful in the DMV area.  Currently live in the midwest (2 1/2 years now), prices for houses are so much different than the east coast.  To make a long story short, my wife and I are evaluating a portfolio with 40 plus doors and looking to make an offer.  If looking at this correctly, it will place us essentially into the "financial freedom" area we've been striving for (but we will still keep our day jobs).  My question to you experienced investors out there, should we use our 401k to make the down payment to get the best interest rate?  If so, how can we do this without paying crazy penalties?  Thanks in advance for your advice!