Technology giant Google has expanded its stranglehold in Pyrmont, on the city fringe of Sydney, with the purchase of the site leased to the Seven Network and owned by property developer, Aqualand.

A spokeswoman for Aqualand confirmed the deal that Google had bought the building at 38-42 Pirrama Road, but did not disclose a sale price.

Seven network building in Pyrmont, now owned by Google Credit:Ryan Stuart

The developer bought the building and the adjoining REVY site in 2015 for a combined $180 million. Property agents suggested Google may have paid close to $150 million, given the increase in land values for city fringe buildings in the past three years.

Google will now have a presence in three properties in the area of Darling Island Road and Pirrama Road, being all of the Workplace6 building, known as the Accenture property, and by next year all of the Fairfax Media site once the group, which publishes the Sydney Morning Herald, relocates, potentially to the City.