Which of the following models of urban structure depicts a commercial spine bordered by an elite residential sector extending outward from the central business district?

The model of urban structure that depicts a commercial spine bordered by an elite residential sector extending outward from the central business district is known as the Hoyt Sector Model. This model was proposed by Homer Hoyt in 1939.

Here are the steps to understand this:

1. Understand the question: The question is asking about a specific model of urban structure where there is a commercial area that is surrounded by a high-class residential area. This structure extends from the central business district.

2. Know the different models: There are several models of urban structure, including the Burgess Concentric Zone Model, the Hoyt Sector Model, and the Harris and Ullman Multiple Nuclei Model. Each of these models represents a different layout of urban areas.

3. Identify the correct model: In this case, the model that fits the description given in the question is the Hoyt Sector Model. This model suggests that cities develop in sectors or wedges. As the city grows, these sectors expand outwards from the center, maintaining their original use. So, the commercial and elite residential areas would extend outwards from the central business district.

4. Confirm the answer: The Hoyt Sector Model is the correct answer because it is the only model that depicts a commercial spine bordered by an elite residential sector extending outward from the central business district.