The skate park is apparently for eight-year-old Shiloh, who loves to skateboard, reported Us magazine.
"She's very into skating. She's a skateboarder," a source said.
The skate park runs alongside the house and has metal grinds and a soft padding area where Shiloh and siblings Maddox, 13, Pax, 10, Zahara, 9, Knox, 5, and Vivienne, 5, can crash safely.
Pitt originally purchased the 5,338-square-foot property for USD 1.7 million back in 1994. The '12 Years a Slave' actor then bought four adjacent lots surrounding the estate to accommodate for his brood.