What does it take to build an office building?

Building an office building is very similar to apartment building in many ways. First, of all it is necessary to purchase the building land, usually in the business area of a city. Apart from regular building elements such as facade, floors, windows, roofs, railings and the entire building envelope, the building itself contains a lot of subsystems. These include electric installations, plumbing, central air-conditioning, heating, elevators, etc. The difference between an apartment building and an office building is that in the office building there are less toilets and kitchen areas. If the company chooses not to use wireless computer network, cables may also be pre-installed.

Source:
http://architypes.net/pattern/elements