ResidentConfirm is a service used by property management firms and closing attorneys to make sure they're on the same page with apartment residents during a building sale or refinance — things like rent, security deposit, and lease dates.
If you received an email from ResidentConfirm, it was sent on behalf of your building's property manager or their attorney. They want to confirm that what they have on file matches what you know before the closing process moves forward.
Nothing about your apartment is changing. The email contains a link to answer a few quick questions — it takes about 5 minutes and works on any phone.
If you have questions about why you received this, contact your property manager directly — they can explain what the process is about and confirm the request is legitimate.