GTC Square is a high-end office complex in Belgrade, Serbia. It consists of five buildings: two of these are newly build and three buildings are completely renovated. Atelier Thomas Pucher  is the project architect and the construction started in 2017. In spring 2019 the square in between the buildings was ready for planting. It had to become a real ‘green heart’ in the centre of the complex that accommodates over 1.000 people each day. To achieve the desired result GTC, advised by landscape consultant and contractor Werft Gardens & landscapes, chose to plant big trees. Van den Berk Nurseries delivered three giant Honey Locust (Gleditsia triacanthos) of 16 to 18 meters. The capricious grow, open crown, and fresh green feathered leaf of the Gleditsia create a friendly atmosphere and are very well chosen in combination with the organic shaped buildings. Besides the clear- stem Gleditsia, 23 pieces of multi-stem Gleditsia triacanthos ‘Shademaster’ and Ailanthus altissima ‘Sangiovese’ are planted in sizes from 5 to 10 meters high. The last one has big, purplish-red, feather leaves that make a beautiful contrast with the Gleditisia and the white facades. The size of the planted trees made it a challenging logistic project but it was worth the efforts as the trees add important value to the complex. GTC Square has become a pleasant and popular place for working.