I've never heard of a talk-formatted station doing it. Has anyone else? I'm not referring to remotes for a limited duration; I'm talking about a permanent studio location.
Well, you kinda-sorta could say WGBH qualifies...their new studios, including the talkshow studio, are at street level and perfectly visible to/from the outside sidewalk. Granted, WGBH is not really a "talk" station per se, but they do run a fair amount of news/talk programming, including stuff they generate like PRI's The World and whatnot. You can see right into the huge bullpen The World uses during the day, too...it's right at the corner of Market and North Beacon, across from the Dunkin Donuts.
Given the gradual shift of WGBH away from music, one supposes eventually it will indeed be a street-level talk station studio setup. :
And yes, WGN *does* have a street-level studio with big plate-glass windows you can see into from the street. The only problem is (and I can personally attest to this) that for most of the day (at least in July) you can't actually see in there because of the kind of glass they used; it's not quite one-way mirror glass, but it's close. Coupled with the way the sun shines...the windows roughly face south and west-southwest...they don't need to have bright interior lights in there to see what they're doing, so it's very hard to actually make out anything.
I'm sure the staff gets a chuckle out of people standing right up at the glass with their hands over their eyes as they're pressed against the glass, squinting to see anything. Perks of the job.
BTW, there used to be a street-level studio for business news/talk over on Needham Street between the FM-128 tower and the Newton Highlands T stop...near the McDonald's there. IIRC it hasn't been there for a while, but there were a couple of neon signs in the window and I think they said "Money Market Radio" and "Let's Talk Stock!". I also vaguely remember there were two AM frequencies posted in the window and both of them were very weak on my car radio when I tried to tune in (this was at dusk or early evening).