Jubilee Party in Kisii County were defaced with used motor oil and human waste.
According to Kenyans.co.ke, the assailants messed the walls and the floor of the offices.
The unknown suspects allegedly stormed the premises in Kegogi Town, Kitutu Chache on Wednesday night and after defacing the offices, they vandalised it.
Security guards in the area allegedly arrested two suspects responsible for the attack but later released them under unclear circumstances.
This is the second incident against the Jubilee Party as in September, rowdy youths pulled down billboards in Homa Bay County declaring that the region was an ODM zone.
The Uhuru Kenyatta and William Ruto-led party has been enjoying massive support but which is waning in different areas in the country.
This is due to allegations of unfettered corruption and looters going unpunished even when there is evidence.