The asset involved in this transaction is an office building located at 335 Madison Avenue in the Grand Central market of Manhattan. The property comprises 874,744 square feet and has been refinanced for a total loan amount of $645,000,000 from J.P. Morgan Chase, replacing prior debt from Citibank.

Summary of transaction details:

• Property Type: Office
• Transaction Amount: $645,000,000
• Address: 335 Madison Avenue
• Market: Grand Central, Manhattan
• Asset Size: 874,744 sq. ft.
• Lender: J.P. Morgan Chase
• Landlord: Kevin Buckley - Milstein Properties
• Loan Type: Refinance

The key individuals involved in this deal are Kevin Buckley and Michael Milstein, representing Milstein Properties. This refinancing marks a significant financial activity for the landlord, enabling them to update the financial structure of their office asset in a prominent location.