Pretty much. You might try to have them fill out a rental agreement for a month to month lease. Who knows they might pay the rent and work out well enough. Plus it will give the information you need to evict in the future if needed.
Houston, we got a problem.... Your process for selling the condo, just got longer. Figure about another 2 to 3 months. Assuming the current T/squatters, don't totally trash the place. You might be better off before going to court. To offer to pay the remaining T money to move. I know this is a hard pill to swallow. But you created a situation that went bad. It's going to cost money to fix. Cheaper to pay the T to move than to evict. Your time, damage to property, lawyer fee. Just the way the system works. Not fair to Landlords at all.