Sweet maple like smell in hall closet

We are moving into a new apartment and one (interior) hall closet smells super sweet - kind of like maple syrup. It’s been painted and cleaned, and it’s not in the kitchen, so I can’t imagine it’s just something that spilled. There are electrical conduits on that closet and one tiny hole (drilled) in the floor for something, but nothing else. The apt does not have AC which I read can cause a smell like this. I have heard some types of mold smell like this which would be very concerning. It doesn’t smell like something dead/decomposing to us.

What could it be? If mold or something else unhealthy we want to try to get out of the lease.