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:
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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.