#Utrecht joining the trees-on-tall-buildings bandwagon. Contruction is almost finished. Although I'm a bit skeptical, they did think through some of the practicalities. It can handle Dutch wind, it has a water retention system, there's cranes installed to lift replacement trees, specially trained (presumably expensive) gardeners will abseil down the building to maintain it. 
Discussion
The neighborhood around it is still work in progress. Directly next to the main train station used to be giant parking lots and exhibition stations, which will be replaced with apartments over the next decade or so - depending on real estate bubbles since this stuff is expensive. 
Looks cool though, wonder how it will evolve in time.