According to a article,  a buyer that was represented by Liberty Property Trust paid $40 million for the lot at 1800 Arch St.  Some think Comcast is a likely tenant:

Hopeful brokers I talked to said a likely occupant for a new building on that site would be its neighbor, Comcast Corp., whose Liberty-built and -managed Comcast Center headquarters, at nearly 1,000 feet, is Philadelphia’s highest building.  Comcast is looking for space and has leased parts of the former CoreStates and Bell Atlantic towers. -Joseph N. DiStefano Another Comcast tower in Center City?

Check out the article Another Comcast tower in Center City?

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