“It’s essential that we have all of your current contact information so that we are able to inform you of any critical information about activity in the building, your lease with us, or for any other reason that your residency with us would require us to contact you.” If they push back, give an example of something major that could happen- an elevator being down, a broken garage door, a fire alarm test… that you would email blast the building about but those correspondences won’t reach them if you don’t have current email and phone info. Examples in general of why you would need it and how they will find themselves terribly inconvenienced if they don’t provide it are they way to go.