09/13/2026
Ninety openings across three floors, and every one reads the same.
When Square, now Block, turned the 1917 St. Louis Post-Dispatch building into a 225,000 square foot headquarters for Square and Cash App, PK-30 was engaged for the enclosed rooms on Levels 4, 5, and 6, released for fabrication as a single 27-sheet binder covering 90 openings.
The design asked for one partition module to serve the whole floorplate: same glass, same black frame, same horizontal divisions, whether the opening held a single office or a twenty-foot conference wall. In a century-old press building where almost nothing repeats, that meant absorbing dozens of one-off field dimensions without letting the differences show.
Two panel types cover the entire scope, framed in black anodic aluminum and glazed in tempered laminated low-iron glass. Two mullion lines, set to the transom above every door and the top of the metal base, run unbroken through every office and corridor no matter how wide the opening beneath them.
At the elevator lobbies, slim posts carry the panel loads and conceal the wiring for card readers and electric strikes, so a secured entry reads as clear glass instead of security hardware.
175 fixed panels, 84 swing doors, 1,746 linear feet, held to one panel language.
Square and Cash App, St. Louis, MO.
Architect: CannonDesign.
Photography: Eric Laignel.
