Calgary has 25 % downtown vacancy ( 13 million plus square feet ) right in the middle of a remote cold million plus urban population with very high vegetable grocery prices and natural gas that we cannot give away. If an old D class structure like Elveden House was stripped back to glass and concrete you have acres and acres of downtown vertical greenhouse farms . The city isn’t getting the tax money from these empty buildings anyways so maybe reclassify them as greenhouse agricultural and start to let things grow. Who knows, maybe we can help youth unemployment, do something sustainable  and feed a few people along the way.