[Clutchcargo]

For such a small area, I'd be inclined to get on your hands and knees with a belt sander until you get all the boards on the same level, then go in with a square buff floor sander to finish up.

 

[Clutchcargo]

This is what I was thinking. What do you mean”square buff floor sander?

mark has it... Homedepot calls it a square buff...