Dietrich | Untertrifaller - DC 3, a narrow complementing apartments tower
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DC 3, a narrow complementing apartments tower

Dietrich | Untertrifaller

Housing  /  Completed
Dietrich | Untertrifaller

The tower in Vienna’s Donauplatte area complements the towers DC 1 and DC 2 by Dominique Perrault and offers 832 apartments for temporary living. The 100-meter-high building is connected on several levels to the existing Donaucity quarter as well as to the transport network via public plazas and paths and forms the conclusion of the Carl Auböck Promenade, which has been incomplete since the mid-1990s. The projections of the three-dimensionally warped façade elements correspond to cozy alcoves, which frame the view of the Danube and the city in every room.

The narrow property – hardly more than a traffic island, surrounded by Wagramerstraße, motorway access and underground line – presented us with great planning challenges. However, the attractive location on the Danube with a view to St. Stephen’s Cathedral and the prominent neighbourhood with UNO City, Perrault-Towers and Harry Seidler’s high-rise were worth taking the risk. For sensible access to the project, we extended the Donauplatte in the area of the Carl-Auböck-Promenade up to the Wagramerstrasse. To overcome the height difference of approx. 6m, the underground line was covered with a bridge leading to the plaza on ground floor. With its seating steps, the bridge provides an attractive public square with views of the Danube and the city.

The plinth contains attractive event and fitness areas as well as spacious recreation and learning zones. A café with a large terrace enriches the public space, as do attractive consumer-free areas. A partially covered roof terrace sheltered from the wind and a green atrium with adjoining function rooms in the base zone promote social interaction among the residents. The 832 apartments extend from the first to the 32nd floor and are equipped with a sanitary unit, a workplace and a small kitchenette. The triangular protrusions of the metal façade are transformed into wooden alcoves on the inside, which serve as heated seat windows inviting residents to relax and enjoy wide views over the city.

The reinforced concrete skeleton with flat slabs is braced over the core in the longitudinal direction or over walls in the transverse direction. The window alcoves are prefabricated as modules and assembled on site. Aluminium slats structure the façade in the basement floors, from the ground floor onwards the tower is clad in aluminium sheets.


 S+B Blan & Bau GmbH
 Residential: 832 student apartments, fitness and event area, roof top terrace
 38700 mq
 Dietrich Untertrifaller
 Vinzenz Dreher
 S+B Blan & Bau GmbH
 statics: KS Ingenieure, Vienna / HAVCR: die Haustechniker, Jennersdorf / heating, façade: Dr. Pfeiler, Graz / fire protection: Kunz, Mödling / wind calculation: Weatherpark, Vienna / soil mechanics: 3P Geotechnik, Vienna / traffic: Rosinak & Partner, Vienna / landscape: Kieran Fraser, Vienna / interior design: BEHF Architekten, Vienna / rendering: Expressiv, Vienna
 civil engineering: i+R Spezialtiefbau, Lauterach / building construction: Granit, Graz / facade: Alu Sommer, Stoob / HVAC: ESW, Vienna / electrics: Keider, Mistelbach / prefabricated bathrooms: Varis, Lendava / prefabricated shafts: Instabloc, Haus im Ennstal / extinguishing systems: FES, Antau / conveyor systems: Kone, Vienna / locking system: Häfele, Vienna; Dormakaba, Vienna; EVVA, Vienna / metal construction: Rudolf, Leobendorf / dry construction: Böhm, Vienna / interior doors: r&r, Perchtoldsdorf / fire protection doors: Ei2 Protector, Ottnang am Hausruck / painting: Polleres, Vienna / tiles: Rott, Vienna / floor: BTS Trendfloor, Villach; Eurofloor, Vienna / signage: Dunkler, Vienna
 © Kurt Hoerbst © EMILBLAU


We are an international studio, focusing on respectful use of resources, development of socially balanced spaces and appreciation of the respective context. Since our founding, we have played a pioneering role in modern timber construction. Today, managed by Helmut Dietrich, Much Untertrifaller, Dominik Philipp and Patrick Stremler, we employ an international team of over 130 people at locations in Austria, Switzerland, France and Germany. The entire spectrum from large-scale buildings, urban structures to alterations of existing buildings and single-family homes defies specialization, inspires creativity and an inquiring mind. A decisive factor in all our work is the resource-saving and appropriate use of materials, with a particular commitment to contemporary timber construction. We are well known for our expertise and maintain this knowhow through relationships of dialogue and trust with clients, craftsmen and engineers. We share our knowledge in course of lectures and in teaching.



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