Attacks by leftists on state or county buildings:
Weather Underground
1969
October 6, 1969 The Haymarket Police Statue in Chicago is bombed; Weathermen later claim credit for the bombing in their book, Prairie Fire.
[I believe that the statue is city property]
December 6, 1969 Bombing of several Chicago police cars parked in a precinct parking lot at 3600 North Halsted Street, Chicago.
[I know exactly where this station is. I was grew up a mile away from that police station]
1970
January - Silas and Judith Bissell placed a home-made bomb under the steps of the R.O.T.C. building. The bomb was made from an electric blasting cap, an alarm clock, a battery and a plastic bag filled with gasoline and explosives.
February 16 A bomb is detonated at the Golden Gate Park branch of the San Francisco Police Department, killing one officer and injuring a number of other policemen (one seriously). No organization claims credit.
June 9 - The New York City Police headquarters is bombed by Jane Alpert and accomplices. Weathermen state this is in response to "police repression."[12][13] The bomb made with ten sticks of dynamite exploded in the NYC Police Headquarters
On September 20, 1970, the group robbed a National Guard armory in Newburyport, Massachusetts and took 400 rounds of ammunition.[7] They also stole weapons and set fire to the facility, causing about $125,000 in damage.
October 6 - Second bombing of Chicago's Haymarket Police monument
October 8 - Bombing of Marin County courthouse.
October 10 - A Queens traffic-court building is bombed.
October 11 - A Courthouse in Long Island City, NY is bombed
1971
August 30 - Bombings of the Office of California Prisons in Sacramento and San Francisco,
September 17 - The New York Department of Corrections in Albany, New York is bombed
1973
May 18 - The bombing of the 103rd Police Precinct in New York.
1974
May 31 - The Office of the California Attorney General is bombed.
1977
November - Five WUO members are arrested on conspiracy to bomb California State Senator, John Brigg's offices.
Source for the above:
https://en.wikipedia.org/wiki/List_of_Weatherman_actions