Premises Class "B" have almost the same characteristics as the Class A offices, but are not as prestigious, and the spectrum the services they offer is not as wide. It is generally Class A offices after 5-7 years of operation. For class offices B is characterized convenient location, that is, the availability of major highways and the proximity of metro stations, well-groomed the area around and a nice view from the window, the appearance of the building looks respectable, but, unlike Class A, no frills in the architecture. Another positive point is the decoration of offices, lobbies and elevator lobbies on high level, but more modest than in office buildings, Class "A". As a rule, the infrastructure of the business center is only a coffee shop / cafeteria for staff, service reception in the lobby and other services to meet domestic needs of tenants. Currently, there is a tendency of separation of offices use: Class A offices are used for placement of top management (as representative), and Class "B" with lower rental rates – to accommodate the majority of employees (the workers). Offices of class 'B' is called 'budget offices' or offices 'economy class'. Differences between the offices of the category 'B +' and 'B' are minor and are, in mainly as a finishing and building services.
Offices of class 'C' to this class of business centers include, first of all, building the Soviet era buildings (research institutes, factories, etc.), disused for offices. Offices of the class usually have the following set of characteristics: are in residential areas of the city, facade neprezentabelen and often require cosmetic repairs, corridor-cabinet system planning. For such buildings is abundant in the walls and corridors. Internal finishing is performed mainly by the tenant, and air conditioning may be absent. These buildings are characterized by low services. Telecommunications services are limited to telephone and Internet access. Parking is formed spontaneously or absent. Offices of class 'D' Office Buildings of this class have a more negative traits than positive ones. Basically, these buildings need major repairs. They are located rather far from the subway, and the availability of parking is not provided. The characteristic features of class offices D: unpresentable view, the absence of conditioning, infrastructure and specialized services, life support, an uncomfortable layout and outdated utilities.