Help! Condo owner needs advice. Negligent/filthy neighbor with extensive water damage and rat infestation!?

I own a condo/town home. I noticed water was puddling in my kitchen from under the baseboard of the wall that adjoins my neighbor. I called a plumber out to be sure it wasn’t an issue in my unit. Couldn’t find anything here. Noticed that the next door neighbor’s patio area had [...]