If they are not in the database then "someone" will need to find them...this would be an excellent chance for you to show everyone what your capable of accomplishing.
Scroll down to the entries for "Biltmore". You can then either enter all the frequencies listed for Biltmore or click on each license and see if any match the address for Biltmore Park and just enter those.
Once you find the frequency or frequencies for the Biltmore Park you can submit them to the database and everyone will have access to them.