Washington's Mall in Wartime

 Doing some research for my cousin who lived outside DC during part of WWII.  

I remember the temporary WWI buildings along Constitution, now the site of Constitution gardens, but I didn't realize how fully the Mall, at least west of the Washington monument was built. (There's problems with accessing the website, but here's the url: http://www.columbia.edu/~fdc/family/dcmall.html )  I didn't realize part of the buildings were dormitories for workers.

[Updated for official photo.]