A 140-Foot Antenna Is on Top of a Tall Building

Short Answer

A 140-foot antenna is on top of a tall building. From a point on the ground, the angle of elevation to the top of the antenna is 27.5°, while the angle of elevation to the bottom of the antenna from the same point is 22.5°. How tall is the building? (Give your answer to the nearest foot.)
Height of building = __________ ft