Blank Street Coffee differentiated itself with its tiny, no-frills shops focused on speed. Now it's opening much bigger stores to lure Gen Z to sit and stay for awhile. Dina Katgara has more. -------- More on Bloomberg Television and Markets Like this video? Subscribe and turn on notifications so you don't miss any videos from Bloomberg Markets & Finance: https://tinyurl.com/ysu5b8a9 Visit http://www.bloomberg.com for business news & analysis, up-to-the-minute market data, features, profiles