Perfectly integrated

An office building reimagines the commercial courtyard tradition

In Rotherbaum, along the northwestern side of Rentzelstraße between Grindelallee and Bundesstraße, the magnificent Wilhelminian-era perimeter blocks still stand as a testament to the district's character before World War II. Street-level retail and restaurants have always occupied this space, with residential floors above. But tucked away in the hidden inner courtyards lay the real heartbeat of the neighborhood—workshops, factories, and manufacturing operations bustled with activity, including at number 10.

Carsten Roth Architekt has now completed the R10 office building in this still-active commercial courtyard, marking the latest chapter in decades of thoughtful, incremental renewal and reimagining. The process began with the meticulous renovation of a 1913 automotive factory—an exceptionally early five-story reinforced concrete structure—and the conversion of a former petrol station into a studio building. A single-family home conversion and a roof addition fronting the street followed. Today, R10 represents the culmination of this carefully considered transformation.

The R10 office building concludes this internal densification with a restrained cubic form: at just three stories, it preserves the courtyard's sense of openness while welcoming light and air. Its modest exterior belies a bold interior gesture: a long, two-story staircase unfolds into a generous atrium with striking vistas and interplaying light. Recessed loggias and soaring ceiling heights punctuated by ribbon-like floor-to-ceiling windows sustain this sense of spatial discovery throughout.

For the external masonry, the architects selected tumbled stone—first slurry-washed multiple times, then hand-sanded to create a luminous, textured surface. This finish underscores the building's harmonious proportions and guides visitors from the courtyard staircase into the interior. Devoid of applied ornament, the R10 possesses a distinctive yet timeless character that feels entirely at home in Hamburg's brick-defined urban fabric.

www.carstenroth.com