Polaris Industries announced Monday that it will turn a newly purchased building in Plymouth into a "second headquarters" by October and relocate about 400 workers there from two other Minnesota locations.

The maker of ATVs, snowmobiles and motorcycles will keep its main headquarters in Medina but is adding the new Bass Creek Corporate Office in Plymouth so it has space to grow, said spokeswoman Marlys Knutson.

According to a real estate certificate submitted last week, Polaris purchased the building at 9955 59th Av. N in Plymouth for $10.9 million in cash. The building has about 120,000 square feet and sits near the intersection of Hwy. 169 and Bass Lake Road.

The office will house Polaris dealer-support and service workers relocated from the Medina headquarters. It will also house IT and Interactive Group workers relocated from a different building in Plymouth, which Polaris plans to sublease. When all employees and operations are relocated, Bass Creek will be the home of Polaris's off-road vehicles division; its parts, garments and accessories division; sales operations; dealer development; corporate marketing and financial services. Officials said they hope to complete the move in October.

"We are excited to open a second headquarters in the west Minneapolis suburbs," Polaris CEO Scott Wine said in a statement. "This additional facility will give us room to address both current and future business needs as we continue to experience record growth."

The Bass Creek office addition is the latest in a series of expansions for fast-growing Polaris, which expects sales to rise from $3.8 billion in 2013 to $4.19 billion this year.

Last month, Polaris announced that it planned to spend $1.75 million to expand its engine assembly plant in Osceola, Wis. That move is expected to create 60 new jobs and retain 200 others. Last year, it completed a $20 million expansion that doubled the size of its research and development facility in Wyoming, Minn. Shortly before then, the company had expanded its Spirit Lake, Iowa, factory.

In the last year, Polaris has also relaunched its Indian motorcycle brand and is building a new type of military vehicle for the Army with tires that don't go flat.