What is a top-class property (referring to an international office building)?

First, "Grade A" and "5A" are three concepts that define the grade of office buildings from different angles, and basically represent the basic direction of evaluating the grade of office buildings. "Grade A" evaluates the grade of office buildings from the perspective of comprehensive quality; "5A" is evaluated from the perspective of hardware configuration; The "fourth generation" set the standard from the perspective of office building development. The three evaluation methods have their own characteristics, and consumers are not clear about each evaluation method, which leads to conceptual confusion.