CHICAGO (WLS) -- Tonight all that's left of the outer right and left field walls of Wrigley Field are broken bricks.
Renovation of the 100-year-old ballpark got into full swing today.
Up first during this off- season: Bleacher walls will be rebuilt to hold seven new advertising signs.
The $575 million dollar makeover will take 4 years.
Wrigley's walls come down
Renovation of the Cubs' home ball park brought down Wrigley's walls on Thursday.