you want physical location of a website? hate to break it to you but it ain't that simple. Websites often get housed in multiple data centers spread across countries, you can lookup the IP in ARIN database and see who owns it and where they are based, but as far as I know there is no way to break down a website to a specific address.
Did you check their website for contact address or tried to contact them through email? the whois might be showing you administrative contact if the domain is not private.