Which of the following structures would be classified as a building?

The classification of a building encompasses a variety of structures, described as enclosed spaces designed for various functions. This category includes prefabricated offices, which, even though they might be outside city limits, are still constructed and used for business purposes.

A structure intended for the storage of goods qualifies as a building as well, considering it provides a defined space for keeping items, fulfilling the necessary criteria of being an enclosed area used commercially.

In addition, a private residence is inherently classified as a building. It serves as a living space, thus fitting within the broad definition of a building.

Since all of these options — the prefab office, the storage structure, and the private residence — meet the criteria for classification as buildings, the correct answer encompasses all of them. This includes various types of structures, ensuring that the answer reflects the comprehensive nature of what can be classified as a building in legal terms.