The biomorphic facade hides an explicitly industrial exoskeleton that anchors the outer skin to the inner structure. The architects left these columns and curving beams exposed within the cavity to preserve sight lines from the ground to the roof.

The building’s spatter-shaped plan consists of 12 folds or extrusions from the face of the building that generate a variety of views in and out. “There are very fast roads around the building,” Arolat says, “so when you see it, it always appears at a different angle and in a different color or light.”

Security is a priority in Istanbul, where political coups, shootings, and bombings occur, and new sections of the city are characterized by gated communities. One of the resulting failings of Maslak’s neighborhood is its lack of public or green space. Access, controlled by guards and X-ray monitors, is limited to employees, which makes the ground floor of most towers impermeable. To mix security and porosity, exclusivity and inclusivity, Arolat designed indoor and outdoor spaces for a café (called Prototype No. 1) at street level. Only employees can enter upper floors—there are no floor-selection buttons in the elevators because staff IDs admit them only to the levels they work on—but the eatery is open to any passerby.

And that, not coincidentally, is where the void begins. Those sitting on the café’s island-like inner terrace, surrounded by a shallow pool of water and its reflections, can look up through the building’s industrial filigree and feel the sun filtering through onto their faces. Not far from security, it is a manifestly peaceful space.

Back to Continuing Education: Tall Buildings

Sidebar: A Thicker Skin

By Shonquis Moreno

To create the outer skin, data describing the climatic conditions affecting the tower were modeled in three dimensions. The resulting curvilinear facade is comprised of 3,792 rectangular, tempered, laminated-glass modules that are 43 inches wide by 52 inches high, spaced 4 inches apart. Those on the west and south facades are fritted with translucent enamel in various opacities and mapped strategically onto the building. The inner skin is insulated glass with a low-E coating. The outer facade is anchored to the inner building’s structure at every fourth floor, creating levels with vertical “gardens” on the southeast—though these are just a few large planters and can only be accessed by opening interior windows. On the north face, however, employees can open glass doors onto metal-grate walkways that extend the length of every floor and provide lounges. To connect the outer glass skin to the concrete building, structural engineer Altineller used three-dimensional vertical trusses on the wider facades facing north. These are the ones fastened to the main structure every fourth floor via a 27-by-27-foot grid of steel beams. The trusses support curving steel beams— dubbed “snail beams.” They follow the form of the undulating outer skin, resting on steel supports that coincide with every glass module. Each of these modules are attached to the inner building by four steel U-profiles. The exposed structure keeps sight lines open. Arolat says, “I consider the structural engineer one of the architects of this building.”