@Joshua Jones that's an absurd price for a bathroom. I just finished a complete basement remodel. I added a kitchen from scratch (had to install a new electrical sub-panel), kitchen cabinets, water line and drain for the sink, a couple walls, a couple closets, new floor, paint, some new fixtures and a bathroom remodel and it came out to $35k total.
I didn't use a general contractor. I subbed the electrical and plumbing out to reputable contractors. I had another skilled handyman (Specializes in tile, but does other stuff as well) do the rest.
A simple bathroom for a rental property should cost you around $5k-$7k in SE or MW. Maybe a little more if it's bigger than 100 sq ft or your doing high end finishes for a flip.
Did he give you breakdown of the quote? You should ask for a breakdown by line item for labor & material. Anything that seems high, look up online what it should cost. Or get a quote from a sub-contractor - Thumbtack is a great resource to find them.