Pinnacle currently is based in downtown Dayton, at 210 N. St. Clair St.
Earlier this year, the building at 460 Vantage Point — directly across from 480 Vantage — sold to a New York investor for $5.2 million.
The biggest employers at Mound today include Excelitas and the Montgomery County regional dispatch center, which is housed in the building at 460 Vantage. Residents who dial 911 from many cities in the area are routed to the Mound building at 460 Vantage.
After World War II, the 306-acre Mound facility made nuclear weapons components and performed research, employing 1,800 people as late as 1991.
Then, during the first George Bush administration, the federal government decided to close the Miamisburg facility, dealing a huge economic blow to the entire region.
Since then, Mound has been engaged in a gradual transition from a Cold War facility to a private business park, with years of environmental clean-up and marketing to win commercial tenants.
As of this spring, there were about 15 businesses with nearly 300 employees total working at the Mound complex. At one time there were 116 buildings at the complex; today, there are about a dozen.