The cost of illegal housing to the taxpayers is in the million. Many of the homes being used as multi-family residences are single family houses being used as 2 or 3 family or 2 family houses being used as 3 or 4 family houses. These owners are paying very little in property taxes and school taxes, however, they have multiple families with many children in the school system. They reap the benefit of large rent rolls and the rest of the tax payers gets stuck paying their bills. Some of these houses pay as little as 2500.00 a year in taxes yet have 3 families with 9 kids in the school system at a cost of over 100k a year. It’s a tough situation to remedy because some of the city hall bigs own some of these properties. An easy start would be to cross reference the property records with school records. It should take a matter of minutes in a database query. If you have a 2 family house that has 4 families using that address in the school system = RED FLAG. a single family with 2 or 3 families using it as an address in the school system = RED FLAG. It’s a start.