Last minute penalty demand by customer

The CEO of a construction company is in discussion with a buyer, who wants the construction company to build an office space.

The CEO almost clinches the deal when, the buyer makes a last minute demand.

The buyer asks the CEO to include a penalty clause in the contract, that would require the builder to pay a hefty penalty if the building delivery is delayed by more than a month.

The CEO is infuriated with this last minute demand.

How would you as a seller respond to this new last minute penalty demand?

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