Auto Trader is relocating its two southern offices in Wimbledon and Reading to Pancras Square North, Kings Cross.
The move will take place on November 24 – just five months after employees in the North of Britain moved into the First Street office in Manchester.
The new Auto Trader centres are connected by direct train services and benefit from strong motorway connections, making collaboration much easier.
Google will also be joining Auto Trader, and other media giants such as Havas Media Group, McCann Erickson, The Guardian Media group, Zone and AMS Media Group, in King’s Cross, helping cement the area’s growing reputation as a media hub for some of the biggest and most forward-thinking digital businesses.
Auto Trader’s director of advertising, Chris Ward, said: “Moving to Kings Cross in London and to First Street in Manchester helps us integrate our resources and will ensure we give all our customers a better service.
“An amazing office and modern working environment will also make it easier to recruit and retain the best talent.
“The strong transport links means we will be perfectly placed to deliver a marketplace to meet the needs of all vehicle buyers and sellers in the United Kingdom.”
Having just two main offices for its 830 employees is part of the 37-year-old companies' strategy to integrate all resources, brands and products and focus on its core business.