When Los Angeles was named the site of the 2028 Olympics, I am sure many people thought fondly of the 1984 Games the city hosted. Los Angeles itself was riding a wave of relative prosperity in 1984, with the Olympics amplifying an already growing business and entertainment economy. Boosted by last summer’s Olympic Games, tourism in Los Angeles County jumped 9.5% in 1984 compared with the year before, according to a report on the impact of tourism on the county’s economy released Friday by the Greater Los Angeles Visitors and Convention Bureau. However, the Los Angeles of 2028 is very different. Today, the viaduct is less an emblem of urban architectural modernity and more a safety risk for drivers, joggers and pedestrians crossing the Los Angeles River at night.