Final answer:
In the context of urban development, 'improvement' refers to physical changes that increase property value like streets and sewer systems. However, trade fixtures are not considered improvements since they can be removed by the tenant.
Step-by-step explanation:
The word "improvement" in the context of urban development and real estate typically refers to any physical change to the property that increases its value or utility. Examples of such improvements include the construction of streets, the addition of a sanitary sewer system, and the laying of a foundation for a building. However, trade fixtures are not considered improvements to the property because they are personal property used in a trade or business and can be removed by the tenant. Therefore, the correct answer to which of the following would not be considered an improvement is C) trade fixtures.