x-1908-baist-detail-of-triangle-blk-twixt-westlake-pine-5th-web September 26, 2016 1202 × 966 Seattle Now & Then: The Westlake Triangle (aka The Silverstone Block) Here is the 1908 Baist Real Estate Map, Westalke Avenue has freshly cut its way through the block and the triangle block bordered by Pine Street, at the bottom, and the new Westlake and 5th Avenue