I always look to Kenny Bozak for Plough info, and Dano was there when it was "happening". I was at 680 WMPS for six months while they phased out "top 40" and phased in country, and got "ploughed under" when the format change was through.
The arrangement was interesting. WHBQ was at least physically removed from RKO's corporate gaze, but the "listen line" was still hooked up from the Drake days, so you never knew when someone big was listening in. WMPS was physically one floor above corporate HQ, so there was certainly more scrutiny, considering the President and National PD were literally hearing you on the way in (piped into the elevator, even). The studios were fascinating for an equipment archaeologist. AM and FM had control rooms, of course. There was a main production studio, and a news booth, both adjacent to AM control. On a half level above, two other teeny prodo studios overlooked the main production room. I know there were times when the main production room would be tied up with public affairs stuff, and I would do dubs in one of those other little cubby holes.
K-97 was automated at that time, and when you recorded spots, you had to program the client info into a punch tape, and feed that through an encoder when you dubbed the spot onto cart. I did one of the two midday shifts on WMPS (Walt Jackson did the other), and voice tracked the all night shift on K-97. As I have explained before, voice tracking on that system required carting up your breaks on a long cart. If you messed up half way thru, you bulk erased it and started over.
WMPS/K97 was on the thrid floor at 112 Union, and Plough corporate was on the 2nd floor. I recall Plough having a record library (and librarian), and a production studio of their own on floor #2.
Out front was an old theatre marquee, and in the heyday they would post 8 x 10 glossy's of the air personalities in the "coming attractions" windows. That practice had passed by the time I came along. Most everywhere I worked, once I got there, stations quit promoting personalities with pictures on surveys, or quit putting weekenders pix on websites... a guy could get a complex, y'know...