What makes the embodied energy of a building a “sunk cost”? It’s a cost that must be built into the budget

What makes the embodied energy of a building a “sunk cost”?

It’s a cost that must be built into the budget but doesn’t relate to a specific budget area.
It’s the kind of cost that can only be assessed through careful analysis of the existing structure.
It’s a real cost that has already been paid in the past and so doesn’t represent a present expense.
It’s a cost that can surface in the budget unexpectedly without attention to energy efficiency.

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