On this incredibly small plot - just 30 by 35 metres - a 130 metre-high residential tower block, the highest in The Hague is built. Het Strijkijzer (the flat-iron) has 351 housing units: three hundred studios for young people and 51 luxury rental apartments. The building has a number of sun lounges, two separate entrances and a total of five lifts, a trendy Grand Café, a launderette and workspaces. And a special glass panorama lift that goes straight to the terrace on the 41st floor. After the top of the building was finished, soon the building started whistling in the wind. The crown of the flat-iron had to be altered to find a solution to the noise. A logbook was kept, of the days and times the building started whistling, and what the wind speed and directions were. With sound recordings the frequency spectrum was researched. By means of the specifications of the building and the outcome of the research, a fitting solution will be applied.