There is no mention in the site doc as to where it was. A street address does not mean it is an unlawful area. Of course, the commenters are already saying it was in a residential area. And in many residential areas it is lawful to discharge guns, such as in mine (not CT). Somebody will need to dig out the details. I checked two other sites but not much more than this one.
NVM.
True, that. In North Dakota, there are street addresses for spots way out in the boonies, courtesy of the 911 emergency system.