Calvanese, George Cauffman, SVP, and Mitch Marcus, VP in theCBRE office, represented Arkema. David Fahey of Binswanger's localoffice represented Comcast. Terms of the sublease areundisclosed.

The average asking rental rate in Center City class A officeproperties is $24.94 per sf, according to a second-quarter reportfrom the local office of Grubb & Ellis. On condition ofanonymity, a Downtown office broker tells GlobeSt.com that thissublease would likely command "less than the approximately$21-per-sf asking rate on a new lease."

In January, Comcast inked a 15.5-year lease for an initial534,000 sf, or about 44% of the 1.2-million-sf, 57-story ComcastTower currently under construction by Malvern-based LibertyProperty Trust. During a second-quarterconference call yesterday, Bill Hankowsky, Liberty's CEO, wasasked if Comcast had yet exercised its option to take additionalfloors in Comcast Center. Hankowsky said it had not and that heexpected Comcast "to reach some decisions soon."