Multihousing refers to residential environments where multiple independent housing units are located within a single building or a group of buildings. These housing arrangements are designed to accommodate several families or individuals while sharing certain common infrastructure and facilities such as entrances, elevators, parking areas, security systems, and recreational spaces. In the context of IoT Security, multihousing environments present unique opportunities and challenges because a large number of connected devices, smart appliances, sensors, surveillance cameras, access control systems, and communication networks operate within the same premises. Proper management and security of these interconnected devices are essential to ensure privacy, reliability, and protection against cyber threats. IoT technology has transformed multihousing by enabling smart building management. Property managers can remotely monitor lighting, heating, ventilation, elevators, water supply, waste management, and security systems through centralized IoT platforms. Residents benefit from smart locks, video doorbells, energy management systems, and connected home appliances. However, the