FBI raids Contra Costa County tax assessor's office

FBI agents raid the Contra Costa County tax assessor's office in Martinez. June 9, 2026 

FBI agents served three search warrants in Contra Costa County on Tuesday morning, including at the tax assessor's office, and the homes of the current and outgoing tax assessor, according to the agency, interviews and video at the scene.

Search warrants at tax assessor's office

What we know:

Spokeswoman Cameron Polan said the warrants were served at an office at 2530 Arnold Drive in Martinez, a residence on Temple Drive in Pacheco, and a residence on West Arlington Street in Martinez.

The office is the address of the tax assessor. Video showed several agents being let inside the glass doors of the office and walking behind a counter full of files.

The East Bay Times first reported that the other addresses belong to the homes of longtime Assessor Gus Kramer in Martinez, and Assistant county Assessor Vince Robb in Pacheco.

Speaking to reporters outside his office on Tuesday, Kramer said: "Apparently, low people in high places are attempting to weaponize the FBI to intimidate the assessment's office regarding some properties’ values, on some very large properties. It’s really too bad."

Kramer acknowledged that the FBI went to his home as well. 

"I say, I used to work for the sheriff’s office. I understand what they’re doing, but all they had to do was come into the office and ask for it politely. We would have given them everything they wanted."

Kramer was then seen in the hallway of the assessor's office, helping customers and speaking with a family to help them sort out their questions. 

Meanwhile, KTVU caught up with Robb at his home, where he said that FBI agents showed up about 7 a.m. with a search warrant and seized his phone and laptops. 

He was upset because they put his children in handcuffs. He said he has done nothing wrong, and they would not tell him why they were there.

What we don't know:

The FBI did not say what they were looking for. 

However, the East Bay Times obtained a copy of the search warrant, which cited allegations of wire fraud and "other offenses." 

It was signed on June 4 by U.S. Magistrate Judge Robert Illman.

A tax assessor is responsible for determining the fair market value of property for tax purposes.

Past allegations

The East Bay Times reported that Kramer has been targeted by law enforcement or faced serious allegations of wrongdoing before but has never been charged with a crime or removed from office. 

For example, in 2019, a grand jury accused Kramer of "willful or corrupt misconduct in office," stemming from the alleged hostile work environment he created from 2013 to 2019.

Back then, Kramer responded on his personal website saying he was the victim of "political persecution." 

He was represented by well-known attorney Michael Rains, who denied all the allegations. The case ultimately resulted in a mistrial.

Outgoing Contra Costa County tax assessor Gus Kramer. June 9, 2026

Kramer grew up in Bay Point and graduated from the San Francisco College of Mortuary Science and the University of San Francisco, according to his biography on the county website.

He was elected Martinez City Clerk in 1986 and joined the Contra Costa County Sheriff Coroner’s Office in 1974. He later served in the Probation Department and the Public Works Department.

In March, Kramer announced he wouldn't run for a ninth term after 32 years in office. He is expected to retire in December. 

Robb has worked his way up the Assessor’s Office over the past 20 years, from junior appraiser in 2005 to being named assistant county assessor in September 2023. 

When Kramer announced he was retiring, he endorsed Robb in the same news release. 

And on June 2, Robb won 68% of the vote in the June 2 election, and he is slated to take over in January. 

His campaign website states that he is committed to "fairly and accurately assessing the value of every property in Contra Costa County." 

FBI agents raid the Contra Costa County tax assessor's office in Martinez. June 9, 2026 

The Source: FBI, visual evidence, 2019 grand jury accusation, interviews with Gus Kramer and Vince Robb, East Bay Times, Local News Matters

Contra Costa County