In George Webb notable video, GW mentions Seattle Underground. Pretty close to CHAZ. Seattle burned down in the 1800s and was rebuilt 2 stories higher. Underground tour starts around the Pioneer Park area.

vault lights

Another way to trace the location of the areaways is to look for sidewalks with glass blocks.Flat on top and prismatic below, the glass let light into the subterranean canyons. Initially developed in the 1840s as deck lights for ships, vault lights were popular in cities, including New York, Chicago, Victoria, B.C., and Boston, from the late 1800s through the 1930s, when electric light prevailed. All of the prisms were originally clear and have since turned purple due to magnesium dioxide, which changes color under long term exposure to ultraviolet light. The reason you don’t see more in Seattle is that individual building owners are responsible for the vault lights in front of their building and it’s cheaper to cover them over than to upkeep them. There are still about 9,000 vault lights in the city.

http://archive.vn/DRUpm#selection-583.0-591.496