Failed chief executive contender Henry Tang Ying-yen promised to accompany his wife - who was charged over an illegal basement at their home - to court, when the case is heard on March 13.
Tang, who was appointed to the Chinese People's Political Consultative Conference (CPPCC) a month ago, hinted that his family is "prepared" for any outcome of the trial.
Tang's wife, Lisa Kuo Yu-chin, was among four people charged last month over a 2,250 sq ft illegal basement at their house at 7 York Road, Kowloon Tong - while Tang himself escaped charges.
Revelations about the luxurious basement in the run-up to last year's chief executive election, together with Tang's handling of the scandal, dealt a fatal blow to his bid for the top job.
The charges could result in a jail term of up to three years and a maximum fine of HK$1 million, the Buildings Department said.
Tang responded to the prosecution for the first time, before leaving for the CPPCC meeting in Beijing this weekend.
"During the campaign for the [chief] executive, which I lost, I have gained the … full support of my family," Tang said.