The homeowners are able to receive assistance through a variety of DHCD programs, including mediation, housing counseling, and information on renters' rights. You want to reach out to make sure they know about these resources as an alternative to immediately vacating the property.
At this early stage, the most important tool a municipality has at its disposal is proximity and status. Close proximity to the homeowner will allow you to keep on top of the property status, and consistent communication will help them to know they can count on their local government for whatever assistance and guidance you can provide.