The news comes as the toll of dead pigs pulled from Shanghai's Huangpu river passed 16, 000.
Officials say the number of pig carcasses found in Shanghai's Huangpu River has risen to nearly 6, 000.
Chen made his fortune in the 1990s through his company Huangpu Renewable Resources, a construction materials recycling firm.
Some 55, 000 people had to make way for the expo site on the banks of the Huangpu River.
Last week, officials retrieved nearly 6, 000 pig carcasses from the Huangpu River network.
BBC: China pig deaths: Toll from Shanghai rivers nears 14,000
Luxury hotels and clubhouses, such as the lavish Cathay Hotel and the opulent Shanghai Club, lined the western bank of the Huangpu River.
The hotel is in the tower-filled Pudong area, across the Huangpu River from the famous Bund, in the Lujiazu business district.
The Beijing News says the ministry of agriculture is investigating the deaths of more than 3, 000 pigs found in the Huangpu River.
In warmer weather, the upstairs roof garden is a great place for tired dancers to catch the breeze off the Huangpu River.
After passing through downtown Shanghai, the Huangpu empties into the Yangtze River.
In a statement, the Shanghai municipal government said that the water in Huangpu River, which is a major source of drinking water for Shanghai, was safe.
The Huangpu River is fed by numerous waterways that begin in the industrial agricultural provinces of Zhejiang and Jiangsu, where Shanghai authorities suspect the animals originated.
Residents near where pigs were being pulled from the river went days in January without tap water when a chemical transporter leaked benzene into a Huangpu River tributary.
Residents near where pigs are being pulled from the river went days in January without tap water when a chemical transporter leaked benzene into a Huangpu River tributary.
Health and agricultural authorities in Shanghai said on Monday they were investigating any potential health impact from pigs found floating in the Huangpu River and nearby waters in recent days, as well as how they got there.
Positioned at Pudong's tip, the Oriental Pearl Tower was a cartoonish totem for China's race into modernity and an emphatic counterpoint to the Bund, a strip of colonial-era buildings on the opposite Puxi bank of the Huangpu River.
WSJ: Shanghai's Pudong District Goes From Soulless to Sizzling
Turning back to China, authorities say that nearly 6, 000 dead pigs found floating down the Huangpu River towards Shanghai were not killed by an epidemic and tap water in Shanghai is not contaminated, 21st Century Business Herald reports.
Shanghai's Pudong district, across the Huangpu river from the old foreign bank buildings on the Bund, shows just how serious China is: a Hong Kong-style skyline of towering buildings, including one housing the largest stockmarket trading-floor in the world, all of it built in just the past decade.
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