University Park Subdivision is bound by an Indenture, originally drafted and adopted in 1922. Not only does the Indenture set the physical boundaries of the Subdivision, it outlines the duties and responsibilities assumed by the Subdivision, as well as the procedures and regulations under which the Subdivision operates. This Indenture is a legally-binding document, recognized by both the state of Missouri and the city of University City.

The Indenture of University Park Subdivision was created in 1922 and amended in 1925, 1933, and 1993.