Los Angeles Superior Court judge Tuesday threw out a 2004 marital agreement that would have given Frank McCourt sole ownership of the Dodgers.
Frank McCourt has signaled he would appeal the ruling, which makes the team community property co-owned by ex-wife Jamie.
The ruling could open the McCourts to new settlement talks.
The now invalid 2004 agreement would have given Jamie McCourt sole ownership of several homes and other property, but that will now become negotiable.
Judge Scott Gordon threw out the 2004 agreement, in part because it conflicted with other post-nuptial agreements.
Frank McCourt has said his legal team would appeal, arguing that he is the sole owner because he bought the team with a company he started before marrying.
Gordon conducted a non-jury trial over the validity of the post-nuptial agreement earlier this year. The issue was in dispute because there were different versions of the agreement.
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One said the Dodgers are included as Frank McCourt's sole property, but another said the team was community property owned by them both.
According to trial testimony, in March 2004, attorney Lawrence Silverstein prepared three documents for the McCourts to sign to enforce their marital property agreement. He said he found an error indicating the Dodgers were the couple's community property and corrected the typo, making the team Frank McCourt's sole property.
He later decided to have three additional copies prepared, but each of those had the original mistake and went undetected, according to Silverstein.
Both McCourts signed the correct versions together, but the three additional copies that he directed Jamie McCourt to sign later had the error, according to Silverstein.
The lawyer said he later took the copies with the mistakes to California and had Frank McCourt sign them in April 2004. Both McCourts have testified they did not read the incorrect documents closely enough to detect the errors.
The McCourts, who were married for more than 30 years, were officially divorced in late October.
Frank McCourt, 57, fired his 56-year-old wife as the Dodgers' chief executive officer the day after the team lost the 2009 National League Championship Series to the Philadelphia Phillies. She filed for divorce five days after her firing.
