The plans include replacing every seat in the stadium, installing handrails, increasing leg room in many sections, and building a structure on the south side that will include suites, loge boxes and a new media area.
In 2005 the stadium installed an "Arena Partition Drape System" – a 1,100 kg black curtain made up of 12 drapes measuring 9 m x 35 m – to vary the audience from a capacity of over 73,000 down to between 12,000 and 46,000, depending on the four different positions that it can be hung.
GoalControl will cost roughly $260,000 per stadium to install in Brazil, according to Broichhausen, but both he and Lindner were adamant that every setup would be different.
However, there are still terms to be thrashed out including how the £190m upgrade of the stadium to install retractable seats over the running track will be paid for.
Other costs, such as the need to modernize stadiums and install computerized systems, have also taken a toll on cash reserves.
Each stadium has installed a version of the Hawk-Eye system, which uses several cameras to determine whether a ball has entered the goal.
Eight large murals on the exterior of the stadium were installed, each depicting four Arsenal legends linking arms, such that the effect of the completed design is 32 legends in a huddle embracing the stadium: Around the lower concourse of the stadium, further murals depicting 12 "greatest moments" in Arsenal history voted for by a poll on the club's website.
It's usually cheaper to turn an older theater, which is typically 30,000 square feet, or half the size of a megaplex, into a cinema restaurant than to install stadium seating and reconfigure the flooring.
Seventeen stadiums have installed solar arrays.
