It comes down to your investment horizon.Good luck with your decision. 

The more familiar you get with the numbers the more solidified you should be in your decision making when that time comes.  

A bad financial decision can set us back a decade.

Ideally someone who's defended their decisions in front of the IRS and won.

The interest you are paying on the loan is paid back to your own retirement account so you are in essence helping it grow and if your money were sitting in a money market earning 0.5% it would make sense to take the loan out and pay interest to your own retirement account instead of some creditor and this would also mean that your 401k is getting guaranteed 4% interest.All of the above and more need to be taken into account in order to decide if this would be sound financial decision. 

Don't offer to mediate, don't offer to make a decision in "favor" of one or the other.  

Hello everyone,I'm on the fence with this investment decision since it is life changing!

In the meantime I let the runner up know that we'll have a decision within 24 hours, but it looks like we'll be moving forward with the other applicant. 

Now I can make that decision from my office and others like it. - this one of possibly thousands of small mechanical steps that go into the decision making process during renovation and flip projects.

Then make a decision on who to contact from there.Also, make sure to be specific when asking them what type of law they practice.