This final paper analyzes the system of office operations in the City of Zagreb as a unit of local and regional self-government. First of all, organizational technology and standardization of procedures are discussed, then the legal framework for organizing office business is given, as well as the definition of the basic terms of office business such as document, submission, classification code, letter number, file, folder, office and others. In addition, the novelties introduced by the „Regulation on office operations“ and electronic operations are listed, such as the information system of office operations, qualified electronic signature, qualified electronic seal, unique written identifier and unique written mark. The central part of the analysis refers to the presentation of all phases of office operations, from the receipt and opening of submission and shipments, processing and sorting of submission, delivery of items and submission to work, to administrative and technical processing of documents, shipping and preparation of items for filing and archives. After that, the City of Zagreb is presented as the obligee of the implementation of the Regulation and the organization and conduct of office business in the City of Zagreb.