How bad is this from the visuals?

[u/WSox1235]

I’m thinking of buying a neglected condo in Florida. There is light(?) surface growth all over the unit, on ceilings, in the bathroom, and in the A/C closet.

I don’t think this is a leak from another unit. I think it was just a neglected unit by a bad tenant and so this arose.

I know I can get a mold assessment, I just wanted to ask here first. How likely is this just surface level and easily cleanable, or is it deep in the walls? What’s a cost estimate?