The datum level of this problem would be Jessica's eye level. If you visualize the diagram, it would create a right triangle. The base would be 150 feet and the opposite angle of the height is 84 degrees.
Using the tangent function:
tan84 = opposite side/adjacent side = h/150
h = 150*tan84
h = 1427.15 feet
The total height would be added with 5 since the height of the building must obviously start from the ground, not eye level.
h = 5 + 1427.15
h = 1432.15 ft
