The fire hydrant missing on the Belmont/Narragansett pic, and the trim above the building, differing between vintage Mr.D's pic and the current Belmont/Narragansett pic are the biggest giveaways to it being Irving and Narragansett.
I blew up the vintage gidorah2003 pix, and lightened it. You can see the street signs with a pretty clear "Narragansett" on one side of the post, and on the other side, while its not clear as to what's the name on the sign, if you zoom in very tight, the name is definitely two words, one longer word followed by one shorter word. Leading me to believe it's "Irving Park"
<a href="http://www.flickr.com/photos/[email protected]
/5320848498/" title="Mr. D's chicago by captain54_01, on Flickr"><img src="http://farm6.static.flickr.com/5249/5320848498_4e2de55b06_b.jpg" width="1024" height="782" alt="Mr. D's chicago" /></a>