Somsak, a key figure in the party and a former education minister, said he accepted the court’s verdict yesterday.
Public prosecutors last year filed the case, asking the court to seize the ex-party list MP’s property, which he had failed to declare when he was a minister.
The house was built in 1998 in his hometown in Angthong province.
The National Anti-Corruption Commission ruled against him by a majority vote in response to his assets declaration as a political-office holder last year, before public prosecutors proceeded with the case.
Meanwhile, the National Legislative Assembly voted to deliberate impeachment cases concerning two former MPs from the Pheu Thai Party on October 6.
The ex-MPs, including key Pheu Thai figure Udomdej Ratanasathien, are accused of abusing their positions for reporting to Parliament instead of fellow party members, and for swapping the amended 2007 Charter concerning the change in the origins of senators that was submitted to the then Parliament speaker.
The NLA refused to consider Udomdej’s request to include additional documents as part of its deliberation, saying the issue was not complicated enough to warrant additional evidence.