The desk and shelves are black walnut, the floor is white oak. A Rubio Monocoat was used on both

That’s great! Thank you so much! May I be so bold as to inquire what colour of Rubio Monocoat was used? (I’m trying to replicate the colour for a work area we’re having constructed in our own place). Thank you again for your patience and assistance in this regard!

There is no color to the product - natural/oil finish.

Rubio Monocoat Oil Plus 2C

https://www.rubiomonocoatusa.com/en/p/products/interior/35-interior-wood-care-protection-products-us/colours-and-protects-in-1-single-layer/15-rubio-monocoat-oil-plus-2c?country=us