The first step is of course demolition, but selective demolition to only take up the bad areas.
Here was an interesting find, an early knob and tube electrical outlet. It has a porcelain socket with contacts on either side, with a cast brass cover plate. I wonder what they plugged into this floor outlet?
Then time to patch the floor with wood we salvaged from under the new credenza. The flooring is Oak with bands of Mahogany, which we did not have a lot of. I had to take some rougher peices and sand them down. Here is everything put back together.
Next up: repairing the old tile next to the fireplace, stay tuned for Part 2.