Can I wholesale an apartment if its underwater in mortgage?

[Breon Smith]

Hi everyone, I'm new to BP but always reading posts to get answers and I'm wondering if I can wholesale an apartment (quadplex) if its underwater. The owner says the mortgage would be their problem so I'm assuming they are going to bring money to the table to pay off mortgage (still have to ask if they're willing to pay off rest of the mortgage). She sounds very motivated to sell, she took the first offer and ask if I'm willing to buy more.