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Wrigley Building, headquarters of Wm. Wrigley Jr. Company. Wrigley Building. Elevator lobby on main floor of north tower. Lobby clock in center. Letter box at right. Entrance to 410 Club and Conference Center at far end. Clock tower on south tower of Wrigley Building, from north tower roof at 5:00 p.m., with downtown Chicago in background. Clock tower on south tower of Wrigley Building, from north tower roof at 5:00 p.m. Closer angle, from northwest. Clock tower on south tower of Wrigley Building, from north tower roof. Tighter angle on clock face at 5:10 p.m. Clock tower on south tower of Wrigley Building, from north tower roof, just after sunset at 8:20 p.m. Downtown Chicago in background. Wrigley Building and Tribune Tower from southwest in afternoon with Wabash Avenue bridge in foreground. Wrigley Building at sunset from Wacker Drive east of Michigan Avenue. Michigan Avenue bridgehouse in lower left frame.