The Portuguese office MASSLAB, in collaboration with AFRY Ark Studio, won the Train Factory Mixed-Use Competition, an international competition in two stages whose main objective was to create a landmark for the city of Helsinki, Finland. The Train Factory Group and the City Council of Helsinki organized the competition, and the proposal "A roof for Helsinki" was chosen. The old electric train building will be transformed into a 45,000 m² complex for offices, retail and a hotel, reimagined as part of the social, commercial and cultural heritage.