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_Adding a 50,000-square-foot attached building that would include a “Geek Suite” area for electronics buffs and fantasy football fanciers.

Even if agreement is reached with the Rams, voters will have to approve any taxpayer money spent on improvements, officials with St. Louis city and county said. Based on the CVC plan, the taxpayer bill would have been about $60 million.

If the Rams and the CVC fail to reach agreement by June 15, arbitration would begin, and that process could last through the end of the year.

The dome was built largely with $256 million in revenue bonds, a debt that is being paid back with $24 million annually in tax money _ $12 million from the state of Missouri and $6 million each from St. Louis city and county.

The Rams pay $500,000 each year to use the dome _ $250,000 in rent and $250,000 for reimbursement to CVC for game-day expenses. The team gets to keep box office receipts, most advertising revenue, net game-day concession proceeds, and some concession proceeds sold for non-football events. The lease also allows use of Rams Park, the practice facility in St. Louis County.

Kroenke purchased a 40 percent share of the team when Georgia Frontiere moved the Rams to St. Louis. She died in 2008, and two years later, Kroenke bought the remaining stake from her children.

There was a recent dispute with the CVC about a lease provision requiring the Rams to play all “home” games at the dome. The dispute was settled, clearing the way for the team to play New England as the “home” team at Wembley Stadium in London on Oct. 28.

In exchange, the Rams agreed to increase the number of football season weekends that the dome can be booked for other uses. The team will also pay temporary employees the wages they would have earned by working the game in St. Louis. The Rams also want to play games in London in 2013 and 2014. No deal has been worked out on those games.