The goal of the study was to use technology like building information modeling (BIM), augmented reality (AR), and sensors to improve the operation and maintenance of mechanical facilities in large buildings. The researchers created a 3D model of a commercial complex and installed sensors in the mechanical systems to provide real-time information. They found that facility managers could visualize the functioning of the facilities online through the 3D model and use AR on devices like tablets and smartphones to help technicians repair and maintain the systems more efficiently. This approach reduced maintenance time, extended the lifespan of mechanical devices, and prevented unexpected failures.