The Zuidkas, a proposal by Architectenbureau Paul de Ruiter commissioned by the Government Buildings Agency in the Netherlands integrates a greenhouse into the roof. “And by integrating both office and residential functions into the same building, the greenhouse serves the additional function of being part of a system of air and water purification. Talk about local food- you just go upstairs.”

There was a lot of discussion on vertical farming lately. This seems to be a bit more realistic and practical. “In most cities it would be hard to find a spot where you get sun on the sides of your building all the time downtown, unless you happen to be on an island like Manhattan. Putting greenhouses on the roof make a lot of sense when you are surrounded by other buildings, which is your typical urban solution.”

rooftopfarming

It also seems to makes sense to develop a mix of uses; their energy uses peak at different times.

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More on Vertical Farms on Treehugger:
Vertical (Diagonal?) Farm from Work AC in NYC (roundup)
Vertical Farm in Dubai Uses Seawater
Adam Stein on Vertical Farms: “Pie in the Sky”
The Future of Farming: Vertical or Horizontal?
Sky Farm Proposed for Downtown Toronto
Mithun Architects’ Vertical Farm for Seattle