Provide admins with a way to edit the contact info (name, email address, cell phone) for full members (i.e., members who are able to sign in and manage their contact info themselves). Since a member may not wish to share certain contact info, and since the email address is part of the member’s sign in credentials, this functionality will need to be offered with security and privacy in mind.
ORIGINAL POST:
Since you are committed to User control and privacy, while Administrators are concerned about completeness and accuracy, would you consider implementing a method that would allow Administrators to add information update requests to users, where the Administrator sends the proposed update and this sends a link to the user to allow them to view and approve the change/update? The big issue with homeowners is that they lack motivation to update material on their own. This sort of extra push would make it as simple as possible to prod them to do it, by mostly doing it for them.