The characteristics exhibited in the question are the ones that mechanistic organizational structures.  A mechanistic structure is characterized by a rigid bureaucratic structure that is controlled by rules and procedures in a clear hierarchy of authority or chain of command. It is tightly controlled or that the span of control is narrow which leads to a relatively tall structure. Work activities are standardized with high degree of specialization.

Tasks in an accounting firm are very specific, rigid, routine, requiring strict rules and regulations. That's why accounting firms will exhibit a much more mechanistic organization structure.