The impressive building housing the theatre of the City of Seinäjoki was designed by architect Alvar Aalto. The white building is located in the Aalto Centre, an administrative and cultural centre designed by Aalto. The centre, which is made up of six buildings, attracts people to visit the architectural complex all year round. In addition to the theatre building, it comprises the Lakeuden Risti Church, a parish centre, a city and state office building, the municipal-provincial library and the town hall.

Aalto drew the plans for the theatre building as early as in 1968. After he died, the drawings were updated to the level required by modern theatre operations while remaining strictly faithful to Aalto's general plan. The theatre building was completed in 1987 under the leadership of Aalto's second wife, architect Elissa Aalto.

The building's light-filled and spacious lobby areas are decorated with Artek's beautiful design products, the handiwork of Aalto. The furniture and lamps of Artek represent a timeless, gracefully ageing style that appeals to one generation after another. For the building's floors, the architect settled on Öland limestone slabs, in which one can see evidence of fossil deposits and fishbones. Light-coloured ceramic rod tiles cover the beautifully rhythmic surface on the building's façade. The building was designed to house four stages. The main stage carried the designer's name – Alvar – while the smaller stage is named Elissa. The Verstasteatteri stage and the theatre restaurant are smaller and the ambience cosier.

Aalto is considered one of Finland's most notable architects whose production is also widely in evidence abroad. He is known as a functionalist whose design work focused on simple and functional buildings. The innovative, even radical architect advanced his knowledge of wood bending processes over many years, with the help of numerous experiments. His unique collection of six bent wood reliefs is on display in the theatre's lobby.