A building system for identity management of a building, the building system including one or more storage devices configured to store instructions thereon, that, when executed by one or more processors, cause the one or more processors to receive a request to determine whether an entity has a privilege and determine whether the entity has the privilege by querying, based on the request, a graph database to identity information of the graph database that indicates whether the entity has the privilege, wherein the graph database stores nodes representing at least one of users, equipment, events, or spaces of the building, wherein the graph database stores edges between the nodes representing relationships between the users, equipment, events, or spaces. The instructions cause the one or more processors to generate a response including a determination whether the entity has the privilege.