Just adding my comments since I spent much time there! Studio's 41 & 42 were approximately the same size, I would guess 100x150 feet. Studio 44 was hardly a studio (by the way I have the original studio 44 switcher). Studio 43 was the CBS network switching control room, I spent 5 years as a switcher there. CBS master control was adjacent to 43 and the studios were one floor below. Telecine was adjacent to studio 41's control room.
Video tape operations was several floors above. The studios and most of Grand Central became television history in the summer of 1964 when CBS moved most of technical operations to Broadcast Center, on west 57 St.
Hope this might be some help to the inquiry recently received.