The property asset involved in this transaction is an office space located at 233 South Wacker Drive in Chicago, encompassing a total area of 52,000 square feet. This asset is part of the Willis Tower, a notable building in the market.

Summary of transaction details:

• Property Type: Office
• Transaction Amount: Not specified
• Lease Term: 10 years
• Landlord: Stephen A. Schwarzman - Blackstone Group
• Tenant: Kristof Terryn - Zurich North America
• Broker: Todd Mintz - JLL

This lease transaction highlights the movement of Zurich North America, as they relocate from 300 S. Riverside Plaza to occupy the 53rd and 54th floors of Willis Tower. Todd Mintz acted as the representative for Zurich North America in this deal, which involved the Blackstone Group as the landlord, an entity that has recently extended repayment on its $1.3 billion loan for the property.