Final answer:
To ensure enforceability of a purchase agreement provision affecting title after closing, both parties must agree in writing and follow relevant laws and regulations.
Step-by-step explanation:
In order for a purchase agreement provision affecting title to be enforceable after closing, two conditions must be met. First, both parties must agree to the provision in writing and include it as part of the purchase agreement. Second, the provision must comply with the relevant laws and regulations governing real estate transactions.
For example, if the provision involves a specific requirement for transferring ownership or resolving title disputes, it must conform to applicable state or local laws.