The "heritage information system" (SIP) is a project that aims to set up a heritage database in the form of "digital twins" to optimize all processes related to the management of departmental heritage (maintenance, works, budget management, rental management, energy monitoring ...) by also facilitating the consultation of information or its valorisation. This project is characterized by a strong innovative dimension based on BIM "Building Information Modeling" and "smart building" allowing data to be traced in real time, thanks to IoT connected objects "Internet of Things". The project will cover all built heritage sites, some of which are listed or classified as historical monuments or even as World Heritage by UNESCO, such as the Royal Saltworks of Arc-et-Senans.