Question 1108905
Draw this to see it.
A straight line from the smaller building across means the angle of sight to the bottom corner of the left building is a transversal and the two parallel lines are a line to the opposite building 30 feet above the ground and at ground level.  There is a right triangle with the base the distance between the two and the height a known 30.
tan 19=30/base
base=87.13 feet

Now, for the other one with the angle of elevation
The triangle has a base 87.13 feet long (from before)
The height is the building's height MINUS 30 feet, since the base of the triangle is 30 feet above the ground
tan 32=h/87.13
h=54.44 feet

The total height of the building is 84.44 feet or 84 feet ANSWER