I’m currently in the pre-approval process to purchase a 2-4 unit multi-family property.

Tenant will also be responsible for the additional cost of any legal notice.

@Jeremy Bloom  the rag on the thermostat can be beat by placing a remote thermostat that is set to the legally required temperature with that remote thermostat actually controlling the temperature.

The first being - don't bring your friends or family into the mix :)Since it sounds like you're pretty solidified in your friend moving in, and it could be a good first roomie, so just to get your feet wet... i'll double down on Laura's advice - do a lease, for the legalities, but i also highly recommend some sort of written (we call it a) Room Mate Agreement.

 Amended, Bill No. 120774-A (approved January 14, 2013). 

If things go truly south, you may as well invest in dry goods, it will be worth more.Cryptocurrency is not regulated at this point, until then it provides a free way for anyone to move money between countries tax free; convert illegal gains from criminal enterprises, legally hide business profits as it's not recognized as money...

I’d be interested on pre approval

Need a creditor attorney ASAP, lenders are generally first for proceeds, but they absolutely will approve a plan you don't love.

@Nik Farooqui You are correct in that GC licensing is never a requirement but it is more of a "silent factor" that can make a lender more comfortable lending hard money and thus the approval and loan process easier.

I would call them and find out if they think you have a reasonable chance of being approved.