Not necessarily from the perspective of the bank, but the borrower/owner, I've heard of the concept of `prevailing market rent` to be a driver of this.

If I rent out a space to A, they may have clauses that reference the rent/average rent for the building vs. their space. So it might be preferential for me to wait to fill a space at a higher price, financially.

In addition, renting out at a lower rate may end up turning up in surveys of rent in the area, leading to a lower average, meaning that future renters of space that is currently rented will try and negotiate downwards in the future.