For what it's worth, the house was not purchased as a investment property-we lived there for a number of years, needed to move and couldn't sell without losing a lot of money so we've been renting it out. 

Stanley,Myself, I would not consider this applicant, they are "judgement proof", they have nothing to lose, but you have everything to lose!

Made me feel like a smaller scaled NYC (without the excess lights of Times Square). 

I won't lose sleep over that but making a bad deal I would lose a lot of sleep. 

Their only risk is losing their cash when markets drop.

Im already paying someone elses money and losing opportunity so why not take a risk at being in the winning side of things?

So he has to pad the difference or lose deposit.I suggest you take it off the market possibly use an agent who is well versed to get your property sold quickly.

Worst case scenrio you lose a relationship and $25k.Do yourself a favor and stay out of it. 

By the way, after vacancy and repairs you won’t make that $100 a month anyways, you’ll be losing money.

You are considered to be disqualified person to your 401k and the IRS rules prohibit any transaction between qualified plan and disqualified person.Taking early distribution not only will be subject to penalties, but also to taxation on both state and federal levels, as a result you may end up losing 40-50% of your 401k balance, not a wise thing to do.