If you love the idea of eating your lunch or relaxing above the city's streets while surrounded by lush green plants and trees, we'd like to hear from you.
The City is working on ways to encourage new rooftop gardens and we're asking people to think creatively to help increase the amount of green space in our city.
As well as proving more green, open space and habitat for birds and insects, research shows that green roofs and walls can help retain stormwater and reduce pollution entering the harbour and local creeks and canals.
Cities around the world, including Adelaide, Melbourne and Brisbane, are currently investigating the benefits provided by green roofs and walls. Studies in Singapore - the world leader in green roofs - show better building insulation, which reduces heating and cooling costs, and improvements in the 'urban heat island' effect.
Chicago, Copenhagen and New York City have adopted plans to increase the use of green roofs. The City of Toronto established its green roofs policy in 2009 and mandates buildings of a certain size to have a set proportion of the rooftop as a green roof.
There are already 49 approved green roofs in the in City of Sydney area, ranging from simple planter boxes to the iconic 2600 square metre roof garden at the MCentral apartment building in Harris Street, Pyrmont.
Green walls are located at 14 sites across the City, including Australia's largest - the nine metres high and 40 metres long installation at the 6 Green Star rated 1 Bligh building.
City of Sydney will identify possible locations as well as opportunities to promote installation. A cost benefit study will model the costs, benefits and risks associated with green roofs and walls. An advisory panel that includes professionals, academics and advocates will help guide this work.
The City will trial different green wall types in our own properties to assess their growing potential, vigour and maintenance requirements.