3LHD won the first prize on the competition for the design of a new business tower at the crossroads of Ljubljanska Avenue and Selska road in Zagreb, Croatian capital. The 3LHD proposed project for a skyscraper 123 metres tall, the tallest in Croatia and region. The idea of the work is based on identifying the problem of the lack of public urban space. The analysis of the site showed the existence of two matrices – a modern urban and the relics of the rural which has been absorbed by the city space, showing that neither model has enough quality public space.
The 123 Tower will have the state-of-the-art DIAGRID structure. This is a diagonal grid, a structural concept distinguished by maximum strength, safety and cost effectiveness. The 123 Tower will be the first building in Zagreb to use this structural concept. The trapesoidal footprint is column-free, thus, different space schemes are possible. Whilst it is primarily a business tower, public facilities - multi-storey lobby and a museum of the city´s urban development on 30th floor - are planned as integral to the building. It is 44,000 sqm (33,000 above ground) and has garage spaces for 350 cars.
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