August 17th 2024 is the 13th anniversary of the first International Geocaching Day.  Ever since the 2011 Geocaching Block Party, geocachers worldwide come together for a day of celebration and smileys on the third Saturday of each August. This day is just one of the many quirks that make the global geocaching community so endearing.
To help celebrate this milestone, here is a MultiCache. Answer from the published coordinates where you can spot an eight digit phone number and a two digit street address.
Your cache is located at S27 36.6AB E153 07.7CD where
A= 2nd digit of street number
B= 5th digit plus 6th digit of phone number LESS last digit of street number
and
C= 3rd digit of phone number
D= the digit that appears most in all numbers
Here is a Checksum (A+B+C+D): 15