This is a very interesting perspective on the culture and values of an organisation as reflected in the way it uses space, and in turn the way it spends money.
Open shared space = areas such as main reception area, staff lounge / pantry.
Enclosed shared spaces = areas such as meeting rooms, server room.
Enclosed workspace = private enclosed offices, usually for senior management, confidential functions
Open workspace = areas for open plan workstations,
The traditional office has plenty of private offices, usually to indicate hierachy. In contrast, the modern office supports the mobile intelligent worker who does not need to work from a fixed location.
In this sample of office G and S as compared against the industry benchmark, it shows the resistance in letting go of territorial space.