Here’s a cool aerial shot of the National Mall from the Capitol and Library of Congress to the Potomac.

Source: Cornell University Library
Here’s a cool aerial shot of the National Mall from the Capitol and Library of Congress to the Potomac.

Source: Cornell University Library
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This has to be later in the 1930s. The John Adams Building of the Library of Congress was opened for business in January 1939 and if you look at it the building is clearly finished – at least mostly from the outside at least – but the ground around it are clearly still in a state of disrepair.
In the upper-left corner the two baseball diamonds and tennis courts along the south shore of the Tidal Basin predate construction of the Thomas Jefferson Memorial which began in December, 1939. Note also the original clover-leaf configuration of the basin itself.
It looks like late 1935 or more likely, early or mid 1936. The Archives is essentially complete, but the FTC is not yet started, and the National Gallery site still has those older half-built structures sitting untouched.