A 30-year old quarry tile floor with grout lines with quarry tile used as the cove base as well. Years of use had broken down the tiles to the point where they were damaged, loose or missing along with grout that was missing and no longer cleanable.
Quarry tile and grout are quite porous and a breeding ground for bacteria. It's slippery, especially from cooking grease and the water used to clean it.
The major problem: it requires thousands of gallons of water every day to clean and maintain, which eventually breaks down the tile and grout and causes leaks into the offices below.