You don't have any image credits on those pictures, but some are by Vancouver photographer
Greg Girard.
Here's the illustrated story of how he came across the realtively unknown Walled City in 1985 and took many photographs over several years, before the entire complex was demolished for a public park in 1994. He published at least one book of photographs, and from time to time has an exhibition in Vancouver with some of them.
Here are three of his images from the article.