Hi all, I apologize if I'm in the the wrong forum, I'm new to this forum and I have a specific scenario that I'm trying to solve for. 
  
I have a business complex which has multiple buildings and I have existing systems that monitor the exteriors and entryways to the buildings. 
  
I have an office which has a large window about 20 yards from my office window.  I need to have a motion detected recording of that room.  This is related to a theft issue and I need it to be high definition because the individuals in question have access to the room as part of their job but I need to see who is doing what.  I have access to the room but a camera would be immediately noticed even if it was "hidden". 
  
I can set up a webcam on a computer which motion detection software, but I can't get the zoom or resolution that I need.   
  
Would you recommend that I purchase a high-zoom camera or is there something I can use to connect my webcam to a telescope or spotting scope or something to get what I need?  This is a temp set up and I can't blow my budget on it. 
  
Thanks!