Home Equity or 401K Loan to finance Multiplex?

[Dave Fellow]

Hello,

I want to build a 5 or 7-plex, but I'm not sure how to proceed.  I have 2 sources to begin the project.  

1. Use the equity in my home to finance the 25% for the construction loan (or I could outright sell the home)
2. Take a loan from my 401Ks to finance the construction loan.

I'm a newbie and am just not sure which route to take.  What do the experienced RE investors think about my 2 options and are there any other options that I should consider?

Thanks so much in advance.