I just counted the arched windows and door placement on the dealer building and comparent to church and figured a retrofit matched up good.
and then the modern aerial says "dealer" to me .. big giant building, proximity to curb, huge overhead doors, with a big asphalt (and a strip building) lot for used cars.
this is where I got the Lamar address. source:
Union Chevrolet Memphis Tennessee - The Supercar Registry
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you're right tho ... i cannot confirm they are the 1940's Uniion building is same as the chruch building (I forgot about using the historical aerial site)