open space.Undeveloped (or mostly undeveloped) urban or suburban land that is set aside and permanently restricted to agricultural, recreational, or conservational uses. • The land may be publicly or privately owned. Access may be restricted or unrestricted. Open spaces are not necessarily in a natural state: the term includes land used for public parks, gardens, farms, and pastures. But it does not include structures such as parking lots, swimming pools, or tennis courts.

[Blacks Law 8th]