Cornerstone reportedly is tapping Eastdil Secured to sell One Van de Graaff Dr. Eastdil officials declined comment on the matter, as did Steve Jacobs, director of dispositions for Cornerstone. "I can't discuss individual deals unless there's something to discuss," Jacobs tells GlobeSt.com. Nonetheless, sources insist the building is going up for sale, and claim Eastdil has won the assignment. The Boston Eastdil team includes James McCaffrey, Peter Joseph and Christopher Phaneuf.

"It's great real estate," says one source familiar with the asset, constructed in the 1980s by local developer Bruce Silverman. Cornerstone has owned One Van de Graaff Dr. since paying $17.2 million for the property in 1996. The building features a roster of solid credit tenants, including Adheris, Cisco Systems and the University of Phoenix. One source puts occupancy in the mid-90% range, citing the solid location and Cornerstone's stewardship for keeping One Van de Graaff Dr. competitive with newer neighbors.

Although certain areas of Greater Boston have struggled in early 2008, Burlington continues to generate solid leasing and impressive rental growth. Jones Lang LaSalle tracked 183,000 sf of positive net absorption for the submarket in the first quarter, while a review from CB Richard Ellis shows the Route 128 North averaging asking rate has jumped to $25.73 per sf, second only to the Route 128 Central average of $31.86 per sf. A deal at 25 Mall Rd., Burlington's top property, recently signed for $41 per sf, according to sources. The overall average rate for suburban Boston is $22.29 per sf, says CBRE.