You had a signed term sheet and a closing date, and now the lender has withdrawn, repriced, or simply gone quiet. It feels like bad faith. Usually it is a condition that did not get satisfied, a credit committee that saw something the account manager did not, or a shift in that lender's appetite that has nothing to do with you.

There is a ladder here that is worth understanding. A term sheet sets out proposed terms and is almost always subject to a satisfactory appraisal, an environmental report, credit approval and legal review.
A commitment letter comes after those conditions clear. Funding comes after the lawyers. Each step can still fall over, and the earlier ones fall over often.
The appraisal or the environmental report came back differently from what was assumed. The income did not verify to the level presented. Something surfaced in credit or in the corporate structure.
Or the asset class went off appetite while the file was in process, or the lender's own cost of funds moved and the pricing no longer works for them. None of the last two have anything to do with your building.
Get the reason in writing. The reason determines whether this is a file problem or a lender problem. A file problem follows you to the next lender and has to be fixed. A lender problem does not.
Tell the vendor early rather than late, and ask about extending subjects or the closing date while you still have goodwill. Then start a parallel process rather than waiting for the first lender to reconsider. Where the date is tight, the fast commercial mortgage page explains what speed costs.
Run more than one lender on anything time sensitive. Disclose the awkward parts of the file at the start rather than hoping they do not come up, which is the same lesson as reading a decline properly.
And understand that a rate hold is a pricing hold. It is not a promise of funding.
Send us the file and the reason it fell over, and we will tell you what is realistically available and how fast.