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The answer is 320 feet.
We can set up a proportion using the properties of similar triangles:
\( \frac{40}{25} = \frac{x}{200} \)
Cross-multiplying gives us:
\( 40 \cdot 200 = 25x \)
Simplifying, we get:
\( 8000 = 25x \)
Dividing both sides by 25, we get:
\( x = \frac{8000}{25} = 320 \)
Therefore, the height of the office building is 320 feet.