Smart tourist building infrastructure combining centralized network management with distributed apartment-level IoT and access control. The architecture routes all building connectivity through a Reyee-based rack head-end with PoE switching, SAI backup power, and Akuvox intercom systems, while each apartment independently manages electrical distribution, door/window sensors, climate control, and presence detection via Shelly automation modules. This design separates building-wide concerns (network resilience, main entry security) from tenant-level customization (climate, occupancy monitoring, optional sensors), enabling scalable multi-unit deployments with centralized monitoring and per-apartment autonomy. Fork this diagram on Diagrams.so to adapt it for your property management platform, customize sensor types, or integrate additional IoT endpoints. The modular entity relationships support 25+ apartments per building with consistent electrical and access control patterns.