When residential owners do not correct emergency violations, New York City Department of Housing Preservation and Development (HPD) may take action to correct the conditions through the Emergency Repair Program (ERP). HPD may conduct emergency repair work to address HPD Class C violations and Orders, Department of Buildings Orders and Declarations of Emergency, Department of Buildings referrals of certain Elevator violations, Department of Health and Mental Hygiene Commissioner’s Orders, and violations of other housing related conditions. All such work is charged to the building where it occurs. The City is subject to laws governing procurement, contracting, and wages that may make such work significantly more expensive than the price the owner could obtain himself. The City will bill the property through the Department of Finance (DOF) for the cost of the emergency repair plus related fees pr for the cost of sending a contractor to attempt to make repairs. If the owner fails to pay, the City will file a tax lien against the property. The tax lien will bear interest and, if it remains unpaid, may be sold or foreclosed to collect the amount owed.