ANSWER
0.079 miles = 417.12 feet
Step-by-step explanation
The building forms a right triangle with the floor and the observer,
We know the measure of one interior angle of the triangle and the length of its adjacent side. We have to find the length of the opposite side, so we use the tangent of the angle,

Solve for h,

Hence, the height of the building is approximately 0.079 miles or 417.12 feet