While doing maintenance on our nearby Elk's Charter cache we noticed a new historic marker had been placed in the area. The posted coordinates will take you to a plaque which marks the site of the Juana Briones de Miranda Home on Rancho La Purisima Concepion. Take a moment to read about the history of this area.
The coordinates of the final cache are:
N 37 23.5AB
W 122 08.XY1
where
AB : Sum the digits of the number of acres purchased and then divide by 2.
XY : Sum the first 2 digits of the year the acres were purchased and then multiply that by the third digit of that year.