Value Add Property - Appraisal?

[Yaya Y.]

If I want to purchase a value add 4 unit MF, and want to get an acquisition/construction loan how will the bank appraise the property? Will the bank look at the pro forma rent roll and size the loan from that or the typical appraisal process? If the building is currently vacant will they do a comp appraisal method? Trying to figure out how to get the maximum amount for a loan.