A good location for the Disaster Recovery (DR) site could be current primary site. The primary site then becomes the remote location.

The reason for this is, that in the event of a disaster at the primary site (housed in the remote location), your current staff will be on hand and available to manage the standby site (which will now become the primary site).

Distance between primary and disaster recovery sites: How Far Away is Far Enough?
An interagency white paper by the SEC, Federal Reserve and other agencies that came out after 9/11 suggested a 200-mile or 320-km plus separation between the primary and secondary facilities. The two locations should be in a geographically different location. So if one location is prone to earth quakes or floods, then the other location should not be prone to the same conditions. Ideally they should be on a different power grid.

One of the first things to go when a disaster strikes is cellphones or mobile phones. Even if the cellular infrastructure is still intact, there will be some many cellphone calls made, that the system could easily be overloaded. So make sure your DR plan has sufficient contigencies in place without the use of mobile phones.