NYC's Worst Landlords Watchlist
I wish this Google Map had been around when I was still renting. It is one of the best examples of open data I have seen, allowing New Yorkers to check if a landlord has housing code violations before renting.
New York's Public Advocate Bill de Blasio has launched a campaign, called Watchlist, to identify, track, and hold accountable New York City’s most irresponsible landlords. The campaign includes a searchable database and a Google Map of landlords' outstanding housing code violations identified by the New York City Department of Housing Preservation and Development.
Users can search the map by landlord name or by borough. Users can also use the map to report additional violations by a landlord or to report the resolving of a violation.