Zenefits, the free, cloud-based human resources technology company that automates and eliminates HR administrative work for businesses, has announced that due to its rapid growth and hiring it has signed a 10-year lease for a large, new office in Tempe, which will be its second office site in greater Phoenix.

The San Francisco-headquartered company will move into a newly constructed building in Tempe’s Hayden Ferry complex this fall. Zenefits will occupy five floors (135,000 square feet) in the building owned by Parkway Properties, Inc.

“With small businesses across the country wanting to take the HR headaches out of managing their companies, the demand for our HR automation software is off the charts,” said Parker Conrad, CEO and co-founder of Zenefits. “With this fast growth, we need more people to join our team – and a place to put them. We are delighted that we found such a great space here in Arizona.”

The Tempe office which will mirror the careers they’re hiring for in San Francisco — account managers, executives, benefits advisors, HR specialists, operations personnel, sales representatives, and client support staff. The Tempe office will ultimately house more than 1,000 employees. Zenefits already has 600 employees in the Scottsdale office it opened in November.

Zenefits is a free, cloud HR automation platform that makes it effortless to manage a business and its employees by automating all of the associated HR administrative work: compliance, on-boarding, payroll updates, health insurance, and other employee benefits.

Zenefits is widely considered to be the fastest-growing SaaS company in history. In May, the company announced that it had raised $500 million in Series C funding, at a $4.5 billion valuation. Zenefits has more than 10,000 business customers and serves 100,000 employees in 48 states.

Zenefits’ arrival in Arizona last year was the largest expansion from a California-based tech company into the greater Phoenix region since PayPal in 2010.

The expansion in Tempe will enable the company to meet the needs of its rapidly increasing customer base.

“Zenefits initial footprint for market entry has since exceeded expectations, as they expand within one of the hottest tech markets in the U.S. with a new location in Tempe,” said Chris Camacho, president and CEO of the Greater Phoenix Economic Council. “The leadership demonstrated within the greater Phoenix region from leaders such as Phoenix City Councilmember Kate Gallego and Mayor Greg Stanton, Scottsdale Mayor Jim Lane, and Tempe Mayor Mark Mitchell, is to be celebrated as we welcome the expansion of one of the fastest growing tech companies.”

Zenefits currently employs more than 1,000 people, up from just 15 at the beginning of 2014.

Matt Coxhead and Ryan Bartos of Savills Studley represented the growing startup in their lease negotiation along with co-broker, Jon Dishotsky Custom Spaces, who represents Zenefits globally.