Apple is quietly expanding, snapping up new office space across Cupertino.

A local report in the San Jose Business Journal reveals the company to have been "quietly, but consistently" leasing "tens of thousands" of extra square feet of office space.

Apple has been securing extra space since December 2004. As well as its well-known six-building Cupertino headquarters, the company also has premises on Cupertino's Mariani Avenue, North De Anza Boulevard, Lazaneo Drive, Stevens Creek Boulevard, Bubb Road and Bandley Drive.

"In total, Apple has paid city business licence fees or filed an application for a business licence with the city of Cupertino on locations totalling more than two million square-feet," the report reveals.

This includes 850,000 square feet at its existing Cupertino headquarters and an additional 250,000 square-feet acquired this year.