Below is an aerial shot of the former brewery site courtesy GoogleEarth. Main brewery lot on the Emerald Avenue side of the block is quite vacant! The Chicagoland Breweries of the Past website shows a former office of Canadian Ace that is still in use at 3900 South Union. It appears that office is in the south east corner of the large building in the pic below. A fire insurance policy I have issued to Manhattan in 1945 includes a building with that address. I'll be in Chicago this summer, so I hope to check out this site in person and take some pics!