Increase in size after that is probably the result mostly of addition to the superstructure.
"My Attainment of the Pole"
Frederick A. Cook
We were building away at a friendship, uncertain as to how elaborate the superstructure was to be, or, to be more precise, not questioning the future at all.
"I Walked in Arden"
Jack Crawford
From forty to fifty you are building the superstructure, and when you commence building that your progress seems more rapid.
"Dollars and Sense"
Col. Wm. C. Hunter