He stayed an extra 2 months after that, promising to pay.

An extra $200/mo. to me wouldn't be worth it to have so many families/people under one roof.

However, as you're house hacking and may be starting small, there are a few cheaper options out there without all the extra features.

Would you mind sharing the extra language that you put in your lease? 

It involves renting out extra rooms, adding an ADU, converting unfinished spaces, or splitting the home into a duplex.

Again, not sure if a notary is necessary or if its just an extra binding option. 

But sometimes the appraisal comes back higher so I end up with extra equity after closing.

Everyone talks about the BRRRR noone talks about the extra closing costs. 

The investment options open to you by having that extra $16k to invest that would not be open to you if you used the $16k to pay off the debt.For people looking to build wealth, but without a large amount of capital, real estate can be a means to do it, because of the amount of leverage available.  

If you had an extra $100k specifically for investing is this the approach you would take?