Vjesnik Building, International Style office building in Trnje, Croatia

The Vjesnik Building was a 67-metre office tower at Slavonska avenija 2, with a high ground floor, 16 storeys and an antenna mast on top. Its rectangular plan measured 14 by 39 metres. The facade used orange Stopray glass for windows and brown Colorobel glass for parapets, and seven reinforced-concrete columns tapered from 40 × 80 cm at the base to 40 × 40 cm at the top.

The idea of a single home for Vjesnik's newsroom and press arose under director Đuro Kladarin, and a design competition was held in 1957. The cornerstone was laid in 1959 on land bounded by Slavonska avenija, Odranska, Savska and Cvjetna. Antun Ulrich Jr. drew the plans in 1960; construction by OUR Tempo under Mirko Fijember began in 1963 and finished in 1972, when the newsrooms moved in.

The dark glass facade earned the tower the nickname "čokoladni toranj" (chocolate tower), and its design was modelled on New York's Lever House. The 15th floor housed the Laganini FM radio station, while archives of the Tax Administration filled floors 7 to 10. The building also stored archives of several ministries and, at the time of the 2025 fire, equipment of 14 national sports federations and the Croatian Olympic Committee.

The building stood at Slavonska avenija 2, at the junction with Savska cesta, in Zagreb's Trnje district. A tram stop named Vjesnik served lines 4, 5, 14 and 17 by day and line 32 at night. During the November 2025 fire, traffic along Slavonska avenija and its underpass north of the tower was closed to drivers and pedestrians; a temporary bypass opened on the morning of 30 November.

The dark reflective glass earned it the nickname "chocolate tower", and its design was modelled on New York's Lever House. Construction ran from 1963 to 1972; rumours that the tower was leaning after the 1964 flood were false — work had stalled while funds were gathered for modern equipment.