Some buildings are highly specialized: a cement plant or a vehicle assembly plant may be designed so the entire space is committed to one function. This "used for one thing" model also appears when a building is owned by the business that occupies it. Single-use buildings may be necessary (in the case of plants) or nice (offering business owners control over their space and a sense of long-term place).
But they mean the building owner is responsible for all the thigns that can go wrong: leaks in the roof, maintaining the parking lot, etc.
An alternate model has emerged: buildings where businesses rent a space in them. This means the business doesn't have to worry about many of the hassles and risks of maintaining property--they can just worry about the business side.
Sometimes the businesses in a building complement each other. Think of a medical building, or a building like the Columnbia Tower. In a building that big, some of the services that one business needs might be provided by another business inside the same building.
The following are examples of possible synergies:
-DMV -Schools -Healthcare Offices
What is provided as part of the building itself, or by building management? These are often so common that they're easy to overlook, until something goes wrong with them.