THE W9XMT BUILDING

     Scanned* from my copy of the ad, a look at the artist's conception of W9XMT.  We're looking slightly East of due North.  I can vouch for the building and there was certainly a tower there, but I have my doubts about the large building in the background.  (However, the residential housing in that location is all postwar.)

     You can just make out the call letters on the sign over the door.  The sign would have faced busy 30th St.  There's a drugstore there now.
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* And it will need to be rescanned at higher resolution, in hopes of minimizing the moire. This was 720 dpi.