To mitigate the building’s length, the design team developed a reinforced-concrete structure, partly poured in place and part prefabricated, folded into six irregular segments that gently project and recede, rising from six to 10 stories at its highest point. Setbacks starting at the sixth floor allow for generous terraces, while strips of balconies integrate with or protrude from the facades on the west and east elevations, respectively.

Easing the shift to the adjacent housing and leafy streets, a 20-foot-high base extends out along the eastern facade, where it faces a pedestrian walkway. Amenities and services located here include a supermarket, a public marketplace with small shops and restaurants for the local community, and a richly landscaped park on its roof, which can be accessed by a graceful stair from a small piazza and the promenade along Rummelsburger Bay.

To accommodate the intended myriad of small firms, B:HUB’s narrow 65-foot-deep plan features a continuous band down its center comprising seven circulation and services cores, while offices, with ceiling heights of 12 feet, line the perimeter. Exposed reinforced-concrete walls and visible mechanical and lighting hookups impart a relaxed, industrial character, bathed in daylight. For countering the din from the trains, a noise-abatement report was prepared, and the facade glazing was equipped with insulation values that respond to the level of sound emissions: more insulation on the west, which faces the trains, and less on the east. Sustainable strategies include the introduction of green roofs at various levels, rainwater retention via large infiltration basins, flexible layouts to enable diverse uses, and 700 parking spaces for bicycles, as compared to a mere 70 for automobiles.

For the exterior, Barkow and Leibinger turned to one of the firm’s favorite strategies—the “liminal facade,” an independent or “autonomous” architectural element, which gives the building its identity, regulates performance, and, most important, forms a complex spatial and material boundary that mediates between outside and inside. Accord­ing to Barkow, this is “often an area where architects have some operational freedom.”

In selecting a distinct facade material, they explored the possibilities of custom-produced ceramic cladding. Collaborating with manufacturer NBK, the architects developed prototypes for up to 10 sculpted profiles—some with a narrow, scalloped surface, others wider—to clad the facade’s pilasters and balustrades. (By contrast, the cornices have pre-cast reinforced-concrete elements.) To achieve the desired color and stability, a special clay mixture was devised, along with a formula for the glazing to impart luster. A milky-white tone was chosen, says Barkow, because it would be the most effective with the fluted elements in terms of articulating light and shadow.

The design team varied the fenestration and application of the tile to articulate the elevations in two ways: one, a relatively open grid that pauses the pilaster cladding at the cornice line, resulting in a flat, graphic surface; the other, a tighter grid with pilasters that continue beyond the cornice, producing greater depth, dimension, and plasticity. When glimpsed from the passing trains, B:HUB’s folded structure, alternating facades, and sculpted profiles enliven the perception of the megaform as if they were a brief abstract film speeding by.

During the advanced stages of planning, the client abandoned the start-up concept and agreed to two public-sector employers as tenants; they took up occupancy in 2021 and 2022, respectively. Post-pandemic, B:HUB impresses the tenants as a means to counter employees’ growing desire for remote work, by offering them a venue where they gladly spend time and enjoy a quality workplace. Due to their security concerns, however, the first floor now houses a cafeteria and fitness studio for building occupants exclusively, replacing the more neighborhood-focused marketplace approach, and the rooftop park one level above is closed to the public. Nonetheless, two areas remain accessible—the supermarket at the southeast corner and, on the northeast, the stair leading to the park, where locals gather and savor views of Rummels­burger Bay. “But this could change over time,” says Barkow. “All the pieces are in place. The programming can evolve.”