/sede/ of an organization is the place where the organization stays, it could mean the building or the street address, depending upon the context. For some organizations, usually for very big ones, you also distinguish between /sede operativa/ and /sede amministrativa/, or other kinds. If you add 'di' (which in these cases is almost always implicit), it should be clear: sede operativa del servizio sociale territoriale. sede: nome operativa: aggettivo (from where operations start) del : of the servizio sociale: social service territoriale: agg.: in the territory (local to the region, 'comune', 'provincia', whatever ...)