Deregistering with HPD? How?

Has anyone had any luck figuring out how to make an application to de-register from HPD for a previously multi-rental house that is now becoming or has become owner occupied fully and just a 1 family?

I can’t find any information and calling HPD didn’t help me.

Unfortunately I got a mailing suggesting there were defects and laying out how I could file dismissals and I also got something from HPD about re-registering. But at this point, I am partly thru a reno into a 1 family and it seems silly for me to have to re-register given all the DOB materials showing I am converting to 1 family.

When I call HPD they sent me on a goosechase and I came up empty – there just does not appear to be any particular doc I could file to file to simply de-register with the right evidence.