Go west on I-70 from the airport about 90 miles. 

Go through the Eisenhower Tunnel.  The first exit after the tunnel is Dillon/Silverthorne (#205). 

Go left at the light into Dillon.  Travel through Dillon (notice the grocery store and Sports Authority on your left), past the Lake on your right. 

As you enter Keystone, take a right into the Elk Run subdivision (onto Elk Crossing Lane) after the Keystone sign.  Turn Left onto River Overlook Drive. The Star Mountain House is located at the end of the Cul-de-sac on the left. 

The physical address is 31 River Overlook Drive.