Based on the updated facts, you are correct in that any depreciation recapture is not recognized until the asset is sold.
However, you are also correct in that you do need to pick up ordinary income on "excess" depreciation when business use drops to 50% or less. Don't forget that this "excess" includes any Section 179 or bonus depreciation you may have taken as well.
*A reminder that posts in a forum such as this do not constitute tax advice.
Also keep in mind the date of replies, as tax law changes.
