https://www.olympic.org/news/sydney-s-olympic-venues-provide...
http://theconversation.com/hosting-the-olympics-cash-cow-or-...
http://economicstudents.com/2016/09/road-ruin-economic-case-...
There are actually a lot of academic studies now into the Sydney 2000 Olympics economics. Quite interesting.
Most of the facilities are running events full time and many events that used to to be hosted further to the east of the city are now at Olympic park due to the ease of transport and centrality to the majority of the population.
Personally I think the Olympics are a complete joke and totally corrupted by bribes, commercialism and professional sport. They are long past their use by date and bound to take a hit when corruption becomes more unacceptable in more places, but, the facilities built for Sydney do not belong in an essay like this.