The structures are built using balanced cantilever segmental construction.
Since the 1930s they were mostly replaced with cantilever constructions, and became rare except in light aircraft.
By the late 1930s, a permanent bridge of cantilever construction had been built on Broad Street.
It is a three span, twin concrete box girder structure built using balanced cantilever construction.
This type of construction lends itself well to balanced cantilever construction where the bridge is built in both directions from a single support.
Mr. Hejduk's purpose was not to show off the possibilities of cantilever construction.
Your photograph does appear to show a balcony of cantilever construction, that is, one without intermediate supporting columns.
The entire cantilever construction having 275 segments, has been constructed at and average rate of 7 m/day which favorably compares with internationally accepted standards.
The whole design is exceptional because of its cantilever construction that can be seen from the outside.
It is a cantilever construction with two tiers and a row of twelve executive boxes in between.