Interior build-out for Chicago’s priciest penthouse to cost nearly $9 million

After purchasing the top four floors of the Gold Coast’s No. 9 Walton tower for a record-shattering $58.75 million, 49-year-old Citadel hedge fund founder Ken Griffin is shelling out another $8.87 million to build-out the unfinished space.

JDL/HPA

The price estimate comes from a renovation permit issued by the City of Chicago earlier this week:

First time build-out of one residential dwelling unit on floors 35th, 36th, 37th, 38th, and 40th; privately owned and financed as per plans.

It was reported in January that Mr. Griffin had purchased levels 35 through 38 at 9 W. Walton Street in November across four separate transactions. The mention of the 40th floor suggests the inclusion of a private outdoor terrace above the tower’s rooftop mechanical systems. River North-based Marvin Herman & Associates is listed as the interior design architect.

Developer JDL even amended its construction permit back in August to grow the penthouse levels by 7,000 square feet, reportedly per Griffin’s request. While no images of the combined 25,000-square-foot space have been made public, it is said to feature secure elevator access, soaring ceilings, and its own pool.

Despite committing more than $67 million towards his latest Chicago digs, the Gold Coast home is far from Ken Griffin’s most expensive condominium holding. In 2015, the billionaire paid a whopping $200 million for a three-story complex in Manhattan’s under-construction 220 Central Park South skyscraper.

• Renovation/alteration permit at 9 W. Walton Street [Chicago Cityscape]
• Ken Griffin buys unfinished Gold Coast penthouse for a record $58.75M [Curbed Chicago]