Chicago’s world-famous Sears Tower is about to get a big makeover – a $350 million retrofit to be exact. The 1,450 foot tall tower is getting a green overhaul this year to start cutting major costs by reducing its electricity consumption by a whopping 80%, and water consumption by 40%. Chicago’s world-famous Sears Tower is about to get a big makeover – a $350 million retrofit to be exact. The 1,450 foot tall tower is getting a green overhaul this year to start cutting major costs by reducing its electricity consumption by a whopping 80%, and water consumption by 40%. The other overhaul it’s getting is its name: the Sears Tower will soon be the Willis Tower for one of the building’s new tenants, insurance broker Willis Group Holdings. So how is it going to cut back all of its energy and water usage? By replacing all 16,000 of the single pane windows, installing gas boilers, modernizing the building’s 104 elevators and 15 escalators, installing solar water heaters, and putting automatic lighting dimmers in the offices. This retrofit is definitely setting a great example in Chicago’s skyline this year.