I have been involved in business arrangements much smaller than a major NY real estate deal, and even those contracts were written to address a scenario like the one you presented.
If Trump owns (for example) 25% of a property, the owners of the other 75% don’t want to suddenly become partners with some retarded mutant they don’t know — especially under adversarial circumstances. So the partnership agreement will be written in such a way that there is a degree of protection given to all the partners to avoid this scenario.
The most common scenario would be a provision in the contract that covers a case where a partner dies or gets divorced.
RETARD MUTANT IS FAAAAAR TOO KIND