"The usual specification of in-built expansion options here led to the conception of nine office towers, three of which were completed during the first construction phase. They stand as autonomous bodies in slightly offset alignment, connected via bridges and tunnels. Their deep blue glass façades 'lean' against solid-looking concrete slabs containing utility and service rooms."
—Peter Gossel and Gabriele Leuthauser. Architecture in the Twentieth Century. p303.

"The company needed office space which could be expanded in reasonably sized increments. A plan was developed for nine separate buildings, eleven stories in height and containing approximately 120,000 square feet each. The first three of these buildings are constructed. They are connected underground by basements and aboveground by bridges. The cores and service areas form two solid walls of each building, allowing the floor space to be free of obstructions.
"The structure is reinforced concrete with flat slab floors supported on a 30 foot by 30 foot grid of columns. The luminous ceiling turns down at the outside wall, allowing daylight to penetrate into the ceiling void and mingle with the fluorescent light."
—from Yukio Futagawa, ed. Kevin Roche, John Dinkeloo, and Associates, 1962-1975. p164.