One way to do this is to encourage buildings to be built to a Living Building standard : http://ilbi.org/ - which requires agriculture except at the highest densities.

check this link
vertical farming
makes perfect sense for urban gardening.
greenhouse skyscrapers.
http://www.verticalfarm.com/designs.html

While it is very easy to make recommendations and city has even spent a lot on advertisement but there is still serious resistance to changing habits. That is where the gridlock is that needs addressing ASAP. We have to appreciate the urgency here folks.

Yes, using an organics hierarchy to prevent food waste, recover food to feed hungry people then hungry animals, seek industrial uses, then compost uses our organics most efficiently. Then complete the loop by using that compost in abundant local agriculture sites - urgan and regional - which can provide high quality food that increases our food security and improves our food quality....

At present rate of consumption it is a logical and logistical impossibility to develop a GE free organic food production for all of us. Therefore unless we cut back our food needs to a third by eliminating the wasted food that never enters human body and goes from farm to landfill, and reduce overeating we are not going to ever develop a food program that would be eco-friendly and somewhere near carbon neutrality.

It would be possible to shrink the Vancouver food plan to 30% of its intended size if we focus first on eliminating wasted food which is about 40% of produced food and eliminate overeating which constitutes another 30% of the food wastefully consumed plus exposing Canadians to obesity and the impending bankruptcy of the healthcare system. The real issue is whether we are going to let stupidity eliminate our species or we have some ability left to halt our own stupidity to make us extinct.