FACADE WITH INSET AND SHELL MODIFIER IS FAST AS WELL AS EASY.
AS ALREADY CREATED TOWER SURFACE WITH SWEEP MODIFIER.NOW SELECT EDIT POLY THEN SELECT SEGMENT.AFTER THAT PICK ONE SEGMENT OF EACH SIDE OF TOWER USING PRESS CONTROL KEY.
THEN APPLY CONNECT TO ADD VERTICAL SEGMENT ON EACH SIDE OF TOWER THEN SELECT POLYGON USING CONTROL KEYBOARD YOU WILL SEE ENTIRE PORTION IS SELECTED.NOW SELECT POLYGON MODELING UNDER THIS SELECT GENERATE TOPOLOGY.SELECT THE PATTERN THEN APPLY INSET ,DETACH IT GIVE BLACK COLOR TO IT AND REST OF PORTION ADD GLASS MATERIAL THEN ADD THICKNESS TO FRAMES WITH SHELL MODIFIER.YOUR FACED IS READY WITH YOU.