Paris will host the 2024 Olympics 100 years after hosting the games for the second time.
The IOC decided in July to award both Games at the same time, following the withdrawal of four of the six cities bidding for the 2024 Olympics, amid concerns about the size, cost and complexity of organising the world's biggest multi-sports event.
Paris Mayor Anne Hidalgo is promising "cost efficient and sustainable games" when the French capital hosts the Olympics in 2024. "The Commission equally concludes that the many opportunities presented by an Olympic Games 2028 in Los Angeles would far outweigh any potential risks of awarding the Games 11 years in advance instead of 7 years".
In July, the International Olympic Committee announced it would award the staging rights for the 2024 and 2028 Olympics at the same meeting in Lima, laying the way for a swift agreement between the two over the running order.
"We all look forward to a spectacular Games in your lovely city", Blackmun added, before crediting L.A. Mayor Eric Garcetti and L.A. 2028 Chairman Casey Wasserman for making the California city's bid an attractive one to the IOC.
The pre-ordained outcome did little to dampen celebrations inside the Lima Convention Centre, where Paris and Los Angeles officials cheered and congratulated each other.
International Olympic Committee chief Bach first signalled publicly that the double-award of an Olympics could be on the agenda in December previous year, lamenting that the bidding process produced "too many losers".
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"Usually you have two or three cities crying in the corner at this point being asked how they feel to have lost".
"Paris and LA are two great world cities with exceptional Games plans, and they will provide unforgettable stages for sport". The IOC made a decision to award two games at the same time, and LA later abandoned its bid for 2024 during negotiations with the IOC and Paris.
"The Olympic Games is WBSC's first priority".
As the tussle for 2024 unfolded, and as the field thinned to leave just Los Angeles and Paris, the IOC's determination to secure two high-quality bids for the next two summer games became apparent.
"Today is a historic and happy day for the entire Olympic Movement", Bach said.
Tokyo will host the next Olympic Games in 2020.
It wasn't such a bad idea considering the news still seeping out about a bid scandal involving a Brazilian IOC member's alleged vote-selling to bring the 2016 Olympics to Rio de Janeiro.