It also depends on the situation sometimes a HELOC is warranted for short term financial needs so long as you have a plan to get back in the same or better financial position afterwards and the "means," and "will," to carry out this financial or mortgage plan- HELOC's are typically full documentation qualifying loans so you'll need actual income to qualify whether it be from pension, insurance, rental's, etc that are all fully documented on taxes, W2's, 1099 forms, etc.

Since we don't have all of the details about your business partner's situation and the types of properties you own I've assumed LTR.

I find myself in a similar situation.

Congrats - do you ever think you'll expand a buy a true standalone STR of just happy with this current situation?

Tough situation man.

Only thing I can think to do is call Vrbo or Airbnb and explain the situation and see if they would allow you to create another account that maybe isn't active to use until the other accounts are shut down?

@Manuel Reza - $99 was the only fee I had to pay so it was worth it for me and my unique situation. 

You may want to think about working with a realtor or a really good attorney to make sure you are set up correctly to start off in the best possible situation. 

I know not all situations are the same but curious if your path. 

They will also know any reasons why it could be a problem or confirm that it can be done in your situation.