Explanation:

- In the passage, we are discussing the cost of apartments in a very tall residential building.

- The sentence structure suggests we're describing the price range.

- A five-bedroom apartment is likely to be quite costly.

- Let's evaluate the options:

- Extreme: Refers to something at the furthest or highest degree, but doesn't naturally fit to describe a price.

- Economical: Suggests something is affordable or cheap, which does not align with a high cost.

- Expensive: Directly refers to something having a high price, suitable for describing a costly apartment.

- Excessive: Implies something is more than necessary, but doesn't naturally describe a price.

- Correct Answer: Expensive

- It fits the context of describing the high cost of a five-bedroom apartment.