I have an office that I used to do online classes from, still equipped with a mini white board. I am not down here too much these days, but it will be Tax Return Central once again shortly. It is fairly plain with dimensions approximately equal to the size of the jail cell they were going to put Michael Jackson in, that is 5.5 ft by 11 ft.
I have a big cubby hole structure that we inherited that is filled with books and odds and ends. I plan to replace with more custom made concealed storage cabinets with doors that I can store my hunting and fishing gear in as well as some assorted books and other office items. The first step will be to discard unneeded items.