Leaky Sewer Line
What you're looking at is the cast iron sewer line. This pipe is 55 years old, and is leaking in several places (only one shown). This old pipe really should have been replaced, and that is an expensive proposition. I was relieved when the buyer decided to walk away from this house.
My search showed that no permits were pulled for this complete remodel. Please don't be fooled by nice amenities. Having a seasoned, experienced inspector 'peel back the layer' to look at what lies beneath is vital.