Not sure what the light post and car have to do with the original photo with the woman on top of the garage? The round bulbs were along the sidewalks of Spring Street and the taller four disc lamps were in the center median. This photo is prior to construction starting on the Civic Center in 1975.
Good job knowing that ZZ Top was the first rock concert at the arena. We can compromise and date the original photo between 1974 and 1977 seeing her head and sweater may be blocking some vital clues.
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