Give some stream of consciousness and then the answer. Key West is located at 24 ° 33 ′ 33" N 81 ° 47 ′ 03" W ﻿ / ﻿ 24.55917 ° N 81.78417 ° W ﻿ / 24.55917;-81.78417. The maximum elevation above sea level is about 18 feet (5 m), a 1-acre (4,000 m) area known as Solares Hill.

Based on this passage, what is the highest elevation of key west?
To answer this question, we should know that: The maximum elevation above sea level is about 18 feet (5 m), a 1-acre (4,000 m) area known as Solares Hill.
Therefore, the answer is about 18 feet ( 5 m ).