Honestly, I would not sign any lease until you positively close and legally own the property.

If you need financial help, ask under the "Finance, Tax, and Legal" forum.

Just be sure to be prepared to get legal advice if you run into grey areas that you are not well versed in to avoid legal implications.

Its my understanding that SF has pretty tight Air BNB restrictions like you have to register and can only rent them a certain number of days a year?

In Illinois, when an agent does that, there are functions normally expected of the realtor that they are legally prohibited from doing.

NC has many licensing restrictions so many lenders won't touch the state or require the partnering LO or broker to be licenced there. 

If you need financial help, ask under the "Finance, Tax, and Legal" forum.

Well, what would be happening is that your buyer would be buying your house subject to the existing note, since you can't legally sell the property without paying off that note or transferring the debt to the new buyer.

Quote from @Cheryl Abram: What legal filed docs are LPs entitled to see to help validate a deal's failure?

You can legally change or cancel a contract if all parties agree.