This is pretty cool. Look at it today on Google Street View.[googlemaps https://maps.google.com/maps?ie=UTF8&layer=c&sll=38.935594,-77.019736&cbp=13,228.82,,0,-4.08&cbll=38.935822,-77.019555&q=612+princeton+st+dc&hq=&hnear=612+Princeton+Pl+NW,+Washington,+District+of+Columbia+20010&ll=38.935594,-77.019736&spn=0.005683,0.011319&t=m&z=14&panoid=KeDU-qEKrmWSQbckWBhbbQ&source=embed&output=svembed]
And check it out back in the early 1920s.
Source: Library of Congress