5-over-1 refers to a building/zoning design where you have one floor of commercial business space on the ground (typically small businesses, cafés, etc.) and then around 5 floors of residential apartments above it. Your classic "mixed use" neighbourhood: great for land values, walkability, sustainability, transit, cycling, etc.

I'm dubious about the claim that neoliberal policies naturally lead to this design though, as those with the money routinely seem more interested in paving a few hectares of green belt and filling it up with single family homes.

What would be helpful is for zoning bylaws to start redrawing cities with more 5-over-1 areas, replacing wide/noisy/dirty/dangerous through roads with narrow winding ones and broad sidewalks littered with trees and cafés.