HONG KONG (Reuters) - Hong Kong’s top court on Wednesday upheld a corruption conviction against a billionaire property tycoon, putting an end to one of the most high-profile corruption cases in the history of the Asian financial hub.

Hong Kong tycoon Thomas Kwok arrives at the Court of Final Appeal in Hong Kong, China June 14, 2017. REUTERS/Bobby Yip

The five-year-long legal battle exposed the cozy ties between government officials and powerful tycoons.

The panel of five judges on Hong Kong’s Court of Final Appeal found Thomas Kwok, the former co-chairman of Hong Kong’s largest real estate company Sun Hung Kai Properties Ltd, the city’s former number two official Rafael Hui and two others, guilty of the charge of “conspiracy to commit misconduct in public office”.

Chief Justice Geoffrey Ma said of Kwok, 65, who had been released on bail during the appeal: “It will now be necessary for him to return to prison”.

Kwok looked calm but disappointed and lowered his head when he heard the verdict, according to local media.

He was sentenced to five years in jail and fined HK$500,000 ($64,440) in 2014. He had already served part of that sentence before the appeal.

No more appeals could be made on the case.

“HOPELESSLY COMPROMISED”

The landmark trial tarnished Hong Kong’s reputation for clean and efficient governance, with Sun Hung Kai Properties paying Hui millions of Hong Kong dollars in bribes, indirectly through two others, to gain government favor.

Slideshow ( 4 images )

In a written summary of the judgment, the court wrote that once Hui had accepted a HK$8.5 million payment, “his independence when he assumed office would be hopelessly compromised and he could not properly discharge his duties nor be trusted to do so”.

“The abuse of public trust contemplated by the conspirators was clear”, the statement added.

Hui, currently serving his seven-and-a-half years jail sentence, served as Chief Secretary and led the civil service from 2005 to 2007.

During that period he was involved in important policy matters concerning two large property developments in which SHKP had “substantial interests,” the summary noted.

The defendants’ lawyers had asserted that Hui did not perform any specific act during his tenure to favor SHKP, and the payment was made shortly before his term started.

But the court dismissed the arguments and said “those who were paying Rafael Hui that sum were not ‘running a charity’”.

Thomas Kwok’s brother and SHKP chairman Raymond Kwok, who was cleared of his charges in relation to the case in 2014, said he felt sad and disappointed at the outcome.

Thomas Kwok’s son and executive director of SHKP, Adam Kwok, told reporters after the verdict he felt helpless but accepted the judgment.

“You can say he’s careless ... you can say he’s overly generous, but I know in his heart he does not have any intention to bribe. He really is an upright person,” he said.

The two other defendants in the case are former SHKP executive director Thomas Chan and former Hong Kong Stock Exchange official Francis Kwan. They are now serving a six year and five year prison sentence respectively.