@Krista369 Many hosts who do long-term stays do ask guests to sign a separate lease. I don't do long-term, but I have read about it in this forum. Tenancy laws are tricky, and vary from state to state.
If I were in your shoes, I'd first research the tenancy laws in your local jurisdiction very carefully, and then take steps to understand how this might affect your hosting gig. I'd venture to say that the majority of your guests will just be looking for a place to stay, with no intention of attempting to establish tenancy and basically squat in your condo. However, it is a concern. You're in a tough spot because of your condo association's rule.
You might also check with your insurance carrier (you HAVE to have a policy specifically for STR, or you won't be covered if anything happens with a guest), to see if your policy would cover any legal costs associated with having to evict squatters.
You can also vet your guests really carefully, with general questions about why they are coming to the area, and why the extended stay. You can make it a little more pleasant than what I've just written. In the long run, a quick consult with an attorney might help, and they might also help you with a lease template that will protect you. You might want to turn off Instant Book and have guests request to book. That gives you a better opportunity to screen guests.
Last, be sure to include the fact that you will be having guests sign a separate lease agreement in your property description, so it's not a surprise.
Good luck!