the latest towering building planned to grace the new york city skyline is one madison avenue by architect daniel libeskind. the 54-story condo building stands out from the crowd of glass towers by incorporating a series of ‘sky gardens’ at different parts of the building. the green spaces would be enclosed in cylindrical glass tubes at the centre of the building and cut-aways in the face would open them up to the outside. the openings also provide the condominiums in that part of the tower with balconies. while the images here depict a rather daring design, they were made over a year ago and have probably changed dramatically. however more details on the project can be found in libeskind’s new monograph ‘counterpoint’. 
www.designboom.com/weblog/cat/9/view/4726/daniel-libeskinds-green-new-york-tower.html