Old Trolley Barn Park in University Heights sits on the two-acre site where the San Diego Electric Railway built a 60,000-square-foot reinforced-concrete carbarn in 1913 to store and service several hundred trolley cars. The carbarn operated at Adams Avenue and Florida Street until 1949, when bus service replaced the streetcar system and the building was sold to the San Diego Paper Box Company. After the structure was demolished in 1979, community advocacy through the University Heights Community Association led to the park's dedication on April 6, 1991. The City of San Diego designated the site Historical Landmark No. 369 in 1998, and interpretive plaques along a winding concrete path trace the old trolley route with embedded street names the cars once passed. The park overlooks Mission Valley from the northern edge of the mesa, where a scenic overlook provides clear sightlines across the river basin toward Serra Mesa. The University Heights Community Development Corporation has produced free summer concerts in the park for 27 consecutive years, a performing-arts tradition that extends the neighborhood's stage calendar alongside the year-round productions at Diversionary Theatre on Park Blvd. A full playground with slides, swings, and rubberized surfacing occupies the eastern half of the lot, flanked by open lawn and picnic tables under tall palms — several of which are survivors from the adjacent Mission Cliff Gardens, a 38-acre botanical destination created by John D. Spreckels in 1898 that once included Harvey Bentley's Ostrich Farm. The grass field sits flush against the Adams Avenue sidewalk with no wall or barrier, one of the few parks in the 92116 ZIP where foot traffic from the commercial corridor feeds directly onto the lawn — a layout that draws the same family crowds who fill the brunch tables at Parkhouse Eatery on Park Blvd two blocks south. Park Blvd runs straight south into Balboa Park, putting this section of the Normal Heights community within a mile of the museum cluster along El Prado. Families driving to the San Diego Zoo from the northern suburbs pass through Adams Avenue on their way to the Park Blvd entrance, and the park's open lawn serves as a natural staging point for pre- or post-visit picnics. El Cajon Blvd, one block south and parallel to Adams Avenue, connects the park's western edge to the Lafayette Hotel's mid-century campus at Mississippi Street. The annual Adams Avenue Street Fair — one of San Diego's largest free music festivals each fall — routes vendor stalls and stages past the park's frontage, and the spring Adams Avenue Unplugged acoustic series draws foot traffic along the same corridor. Cobblestone walls and redwood gate posts from the Mission Cliff Gardens era remain visible along the surrounding sidewalks — designated as City Historical Landmark No. 346 — making the two-block radius around Old Trolley Barn Park one of the densest concentrations of historically designated structures in the Mid-City community plan area.