TeleSign, a maker of identity verification software, is more than doubling its space in Marina del Rey by moving into a bigger headquarters.

The company, which occupies 10,000 square feet at 4136 Del Rey Ave., signed a lease for 21,500 square feet at 13274 Fiji Way, a six-story, 60,944-square-foot Class B office building owned by Kennedy-Wilson Properties. TeleSign will occupy the top two floors of the building.

The six-year lease is valued at $6.5 million, according to industry sources.

The space will serve as the company’s headquarters as it grows its head count, said Dave Toomey, a principal at tenant brokerage firm Cresa Los Angeles who represented TeleSign. The space has the capacity for 150 employees.

Brian Davies of Cresa also represented TeleSign. Michael Geller of Beverly Hills firm First Property Realty Corp. represented Kennedy-Wilson.