The property involved in this transaction is an office asset located at 433 West Van Buren Street in Chicago, covering an area of 50,000 square feet. The total office space occupied by Vizient is now nearly 190,000 square feet, following this expansion at the Old Post Office which was previously leased by Uber.

Summary of transaction details:

• Property Type: Office
• Transaction Amount: Not specified
• Square Footage: 50,000
• Address: 433 West Van Buren Street
• Market: Chicago
• Landlord: 601W
• Tenant: Byron Jobe - Vizient
• Landlord's Representative: Matthew Whipple - Telos Group
• Tenant's Representatives: Joe Learner & Robert Sevim - Savills

The key individuals involved in this transaction include Byron Jobe representing the tenant Vizient, along with Joe Learner and Robert Sevim from Savills acting as tenant representatives. Matthew Whipple from Telos Group represents the landlord, 601W, in this lease agreement.