Well of course that's the legal, textbook position. In practice the commercial reality may be different: potential financial impact on landlord of not getting

Well of course that's the legal, textbook position. In practice the commercial reality may be different: potential financial impact on landlord of not getting rent, costs of legal remedies, current market situation (what happens if they need to find a new tenant), etc. I'm sure Twitter/Musk have agents/lawyers who know the commercial real estate business.