How do I remove this filing cabinet?

Just purchased my first home, and the guest room/office came with this built-in bookshelf that featured a large black filing cabinet in the base.

We knew immediately that we wanted it gone so that we could covert that space into a desk, but it’s been impossible to remove.

Our electrician had to cut the back of it to access the power outlet for rewiring work, but he wasn’t able to pull it out either.

It doesn’t seem to be secured in by any means other than an impossibly tight fit with the surrounding bookshelf.

Does anyone have any ideas about how to remove it? I’m sure cutting it with an angle grinder would probably work, but our HOA has strict rules about use of power tools in the unit. Ideally we also wouldn’t take down the entire bookshelf as it’s securely mounted to the wall behind it.

Thanks in advance!