"Party headquarters" refers to the main office or central location of a political party. It is where the party's leaders and members gather to plan and organize activities, make decisions, and campaign for their political goals. Full definition
The day after the General Election, the MPs asked by Nick Clegg to be part of a negotiating team to deal with a hung Parliament met at party headquarters at Cowley Street. (dailymail.co.uk)
Schaffer said that after «two or three» calls from Allinger, a $ 100,000 check from the union arrived by Federal Express at Democratic Party headquarters in Bohemia. (newsday.com)
Since then, vandals have struck several offices, including the Sedgwick County Democratic Party headquarters in Wichita. (voices.washingtonpost.com)