A simple task that is now available to update online at http://www.nyc.gov/hpd, this yearly property registration is required from residential buildings that are greater than three units or 1-2 unit residences where the owner does not reside on premises. The forms tell the City of New York who the owner, agent and responsible parties are for all residential buildings in the case of an emergency (or a violation). Registrations are required to be renewed by September 1st of each year, so if your building is outdated, now is the time to update it before it becomes a deeper issue.