Contractor selection plan for the package: Maintenance service to fire extinguisher refilling, resistance measurement; Camera system maintenance services in apartment buildings; Elevator system maintenance service; Cleaning services for underground tanks and suspended tanks of apartment buildings; Cleaning service for buildings HH1-HH2 and HH3-HH4 Dong Quoc Binh; Security services for apartment complexes and security services for state-owned property and land in 2024 are managed and operated by Hai Phong Housing Management and Trading Company Limited and a number of companies. other consultants.