I think a number of people are perplexed as to why Sam’s Park & Shop in Cleveland Park is landmarked. Aside from the political pressure of a well-connected population dead set on preventing the density that would actually save their failing retail strip using historic preservation laws, the site does have some significance.
The Park & Shop was point along the trend to adapt retail architecture to modern conditions. In this page from the May 1932 Architectural Record, the author praised the Park & Shop in contrast to a traditional main street retail strip. He might as well have been describing the service lane block.