Cody Jones' penthouse appears in the 2003 series season Fast Forward. It is where Cody Jones lives, with his robot Serling.
There are numerous rooms inside the penthouse, all of them quite spacious. When the Turtles first arrive at the penthouse in "Future Shellshock" one of the first rooms that Cody takes them to see is a shrine to them and to Cody's ancestors.
In "Home Invasion" Cody has built a Holo Dojo in a cavernous room inside the penthouse.
Other rooms seen in the series are the kitchen (where Michelangelo spends a lot of time), a bathroom, Cody's bedroom, and his laboratory. Near the kitchen there is a large dining table next to a wall of picture windows.