HPD violation classes

Housing-maintenance-code violations issued by the housing agency are graded by hazard: class A for non-hazardous conditions, class B for hazardous, class C for immediately hazardous — the class driving correction deadlines, penalty exposure, and, for the worst conditions, the agency's power to repair and bill the owner through its emergency programs.

The classes make violation counts readable: a stack of class A paperwork items and a handful of class C heat or lead conditions are different buildings, whatever the raw totals say. Class-weighted open violations per unit is among the most honest single indicators of how a multifamily building is being operated — and it is computable entirely from public records.