My solution would be a combination of solutions already mentioned.
Request a letter from the HO stating they are requesting closing, and why.
Building Department documents thoroughly through narrative and digital images and video, and attach to permit.
Document that when permit is reopened/reapplied for (by anyone), work must comply with code in effect when resumed.
About all you can do, otherwise they walk away, and you still have an unfinished permit. At least they are giving you a heads up.
JMHO, that's how I would handle it, obviously not a one size fits all.