The “height of buildings” is the vertical distance at the center of a building’s principal front, measured from the established grade to the highest point of the roof beams in the case of flat roofs, to the deck line of mansard roofs or to the center height between eaves and ridges for gables, hip or gambrel roofs. For buildings set back from the street line, the height may be measured from the average elevation of the finished grade along the front of the building. (Ord. 369 § 2(15), 1995)