A five-year elevator overhaul that includes bringing in a destination-dispatch system is among improvements underway at the 110-story Willis Tower in Chicago that Willis General Manager Gary Michon describes as “historic,” Energy Manager Today reports. Aimed at reducing energy consumption and improving operational efficiency, the upgrades span six months to five years. Michon says the new elevator system will get tenants to their destinations faster and allow the building’s freight elevators to “talk” to one another. Including the addition of 300,000 sq. ft. of retail, the improvements will help the 45-year-old building retain and attract tenants.