> For who and in what way though?

For anyone who wants an accurate accounting.

Suppose the building is supposed to be worth $20M, has an existing $10M mortgage and is actually only worth $10M. The landlord comes to you and wants to borrow another $5M against the building. Pretty important to the lender at this point that they're not overvaluing it, right? Or the same if they go to a different bank trying to refinance an existing mortgage they're already underwater on when using an accurate accounting.

Commercial borrowers have to pay for a valuation report by a bank approved valuer.