Is it possible to retrieve the location of a contact using the Lync 2013 Web API (or UCWA)? If that is possible, could this be extended to people who are not necessarily in your contacts?
If you are referring to the location property of a contact this is highly possibly in UCWA as long as you can get that contact's href (Resources-contact). Assuming you can it is simply making an additional (GET) request to their contactLocation (contactObj._links.contactLocation.href), and it should be noted that the location returned will be the location of that contact on their most active device (Lync client, browser, mobile).