I have no idea about the contracts, but I could imagine a scenario where Twitter signed a 10 year lease that's expiring in five years or more, and Musk believes / hopes that being enough of an arsehole will lead the landlords to just dropping the contracts instead of risking a multi-year court battle - even if the landlords would eventually win the lawsuit, it will be a risk on their balance the whole time, whereas Musk doesn't have to answer anyone but his creditors about the lawsuit risk.
