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It's a Puffball Mushroom. Don't ask me which species - there are many. Check out the go-to source for California mushroom identification: Mykoweb.
Click here for all the fungus we've documented in the Red Car Property neighborhood.
The Corralitas Red Car Property was a private right-of-way through Silver Lake (Los Angeles) for the Pacific Electric interurban streetcar. The “Big Red Cars” ran until 1955 when the Glendale Line was decommissioned for freeway construction. For more than 40 years, a series of developers tried and failed to develop the Corralitas Red Car Property.
It's not a park, it just looks like one.