One of the largest real estate fraud cases in Sonoma County history is nearing resolution: Ken Mattson, 64, the developer who assembled a $500 million property empire centered in Sonoma, has agreed to plead guilty to federal wire fraud charges in a scheme prosecutors call a “classic Ponzi” that siphoned at least $100 million from hundreds of investors.
Key Takeaways
- Mattson, co-founder of LeFever Mattson and KS Mattson Partners, will plead guilty to at least one count of federal wire fraud, which carries a maximum 20-year prison sentence.
- U.S. District Judge Jon S. Tigar will decide May 11 whether to accept the plea deal; the agreement includes financial restitution for victims.
- Prosecutors say Mattson sold nonexistent real estate interests and funneled refinancing proceeds into a secret personal account while doctoring records to conceal the fraud.
- Hundreds of investors — many of them church community members — were victimized through Mattson’s real estate investment funds.
- Both LeFever Mattson and KS Mattson Partners are in bankruptcy; the Mattsons also face possible eviction from their $6 million Sonoma home.
A deal nearly two years in the making
Mattson was arrested by the FBI in May 2025 and initially pleaded not guilty to seven counts of wire fraud, one count of money laundering, and one count of obstruction of justice. Roughly two weeks before an April 10 status conference in Oakland federal court, his defense team and lead federal prosecutor Nikhil Bhagat began negotiating. The result: Mattson will plead guilty to at least one wire fraud count, according to the Press Democrat.
Judge Tigar will hold a hearing May 11 to decide whether to accept the agreement. If approved, the case sidesteps what would have been a six-to-eight-week trial — one that wasn’t even scheduled until 2027. After reviewing the government’s evidence, Mattson’s attorneys shifted their position on a plea, Bhagat said.
The scale of the scheme
Prosecutors describe a textbook Ponzi operation run through two companies: LeFever Mattson, which Mattson co-founded with business partner Tim LeFever, and KS Mattson Partners, which he ran alongside his wife Stacy Mattson. Together, the firms assembled more than 200 residential and commercial properties — a portfolio estimated at roughly $500 million, with about half concentrated in and around Sonoma.
According to the government, Mattson “sold nonexistent real estate interests, transferring properties among entities while funneling refinance payouts to his own secretive account, then doctoring records to hide the transgressions.” Many victims were everyday investors, including church community members drawn in by promises of steady dividend returns. In total, prosecutors say the scheme extracted at least $100 million from hundreds of individual and mom-and-pop investors.
The Press Democrat’s investigative reporting, which began raising concerns about Mattson’s operations in early 2023, played a central role in bringing the case to public attention.
What comes next for victims
The plea agreement includes financial restitution, though how much Mattson can actually repay remains an open question as both of his companies navigate separate bankruptcy proceedings. Victims will have the opportunity to review the arrangement and deliver impact statements to the court before sentencing is finalized.
Meanwhile, the Mattsons’ personal finances remain precarious. The couple faces potential eviction from their $6 million Castle Road home in Sonoma as the broader unraveling of Mattson’s empire continues in civil and bankruptcy courts.
Frequently Asked Questions
Will Ken Mattson go to prison?
Under the plea agreement, Mattson is expected to admit guilt on at least one federal wire fraud count, which carries a maximum sentence of 20 years. The actual sentence will be set by Judge Jon S. Tigar after the May 11 hearing, with victim impact statements factored into the outcome.
Will local investors get any of their money back?
The plea deal includes a financial restitution component, but how much Mattson can repay is uncertain — both of his companies are in bankruptcy, and his personal assets appear severely diminished. Victims will have a formal chance to weigh in before any final restitution amount is set.
What happens at the May 11 court hearing?
Judge Jon S. Tigar will decide whether to formally accept the plea agreement at the May 11 hearing in Oakland federal court. If he approves it, Mattson will enter his guilty plea and the case moves toward sentencing, avoiding a trial that had been projected to last six to eight weeks in 2027.
Leave a Reply