ST. LOUIS • The city’s development agency has awarded a Major League Soccer stadium proposal with its highest marks for potential economic value to the city — five stars out of five, a rare achievement.

The St. Louis Development Corp., in a financial impact report released Tuesday, said the city will earn $41 million over 30 years from the proposed stadium, double what it would need to be financially sustainable.

“You’re not going to see a proposal this good anywhere, any place in the country,” said Steve Conway, chief of staff to Mayor Lyda Krewson.

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The analysis, which Conway called conservative, predicts a new stadium would send the city $1.4 million in tax revenue every year.

It also shares a litany of new information with aldermen hungry for details: The present values of tax incentives for this proposal add up to $39.7 million, in comparison to $123 million offered to the effort that failed to land a team last year. The proposed stadium improvement fund, fed by a 2.5 percent ticket tax, would add up to $28.7 million over 30 years. And the ownership group, one part of the report says, “will be responsible for the cost of maintenance and repair of the stadium.”