Housing authority. There are maintenance fund invoices, which are issued by the local housing management department and filed in the maintenance fund window (or department) of the Housing Authority. Maintenance fund invoices are issued by the local housing authority, and maintenance funds are sometimes collected by developers or paid by the housing authority. The housing maintenance fund is used for large and medium-sized repair and renovation projects of the main structure, public parts and public facilities and equipment of the house after the warranty period expires.