Apartment unpermitted loft

I'd like to put an offer in on a co-op apartment but I noticed the loft and the stairs going up to the loft are not up to code. The stairs going to the loft are currently really unsafe. I'd like to redo them to make them safer but since the loft is not up to code, I'm thinking that will trigger DOB. I guess I'm worried that in worst case scenario I will be asked to remove the loft entirely which would be an insane project. Wondering how this works in nyc and if it's worth putting in an offer at all.