A long-awaited zip line adventure park in Roxbury is taking a big step forward.

Flagstaff Extreme, an Arizona-based company specializing in the adventure park concept, has agreed to buy two vacant parcels, totaling 48 acres, off Route 46 and Mount Arlington Road.

The deal was announced July 12 by NAI James E. Hanson, a real estate firm representing the seller.

Flagstaff Extreme did not immediately respond to a request for comment.

According to the real estate firm, the company has similar parks throughout the midwest and is seeking to expand to the northeast.

Plans to build a zip line adventure park in Roxbury have been in the works for years. The Roxbury planning board signed off on the concept in 2012, but the initial proposal -- including cargo nets, monkey bridges, swinging ropes and other challenges -- did not materialize.

Told last fall that a new buyer was interested, Roxbury Economic Development Committee (EDC) Chairman Michael Shadiack said he thought the concept had merit, according to TAP Into Roxbury.

"I think it would be a huge draw, something different that would bring people to town and have minimal environmental impact," he told the website.

John J. Schilp, who represented seller Darl Enterprises, LLC, said the existing zip line approval helped facilitate the deal.

"We were able to leverage the location and strong demographics surrounding the area, in addition to the pre-approval, to attract a buyer that could envision the future success of this type of attraction in this market," Schilip said.

Rob Jennings may be reached at rjennings@njadvancemedia.com. Follow him on Twitter @RobJenningsNJ. Find NJ.com on Facebook