These buildings have "Tropico" tiles, that are a mottled green. Tropico Potteries existed from 1920 - 1923, when it was bought by Gladding McBean. The Gladding McBean company introduced some tile designs of its own, but at the same time continued through the 1920s to manufacture some of the old patterns that Tropico Potteries had originated. So there is no way to tell - except if you know the date of the particular building - whether the tiles were made before or after GMcB took over the operation. The Tropico factory (now in Glendale) was the site of the first manufacturing of art tiles in California, starting about 1901 or so. At least three companies established manufacturing there and then went out of business at that location prior to the establishment of Tropico Potteries. (One of the companies was Western Art Tile).