The Cinema Park Building was erected in the 1950s from plans by the modernist architect Franc Novak. Slowly falling into disrepair, it was still used for film shows until the new century, when it became obsolete due to the construction of a new multiplex. A solution was found in a new, more ambitious programme: a conversion into a theatre and concert hall, preserving the designated landmark modernist building with a fitting new programme. In relation to the existing structure, two concepts were introduced for the two segments of the project. The functional scheme of entry areas already included all the key elements: entrance loggia, lobby and the lower and upper foyers. These parts of the building were renovated, preserving most of the original substance. The existing auditorium’s volume was not suited to the new purpose, so it was replaced by a new, correctly proportioned auditorium space and a techinaically equipped theatre stage large enough to house performances from every theatre in the country. The volume of the original building is clearly delineated in the auditorium’s structure, the added stage volume shows an appropriate compositional distance and retains the autonomy of the original building’s architectural expression.