Welcome to Historic San Juan Capistrano, or HSJC for short. This is part of a mini series of multi caches that are placed at historic areas in San Juan Capistrano.
At the above coordinates you'll find a plaque that talks about the history of the building. Here, is where you can find the coordinates to get the cache.
This building is listed on the National Register of Historic Places. You are looking for a film canister at the final. Please use stealth and replace as found. BYOP.
You can find the cache at: N 33° 30.ABC W 117° 39.DEF
A = The number of bells you see on the plaque and subtract one.
B = The second digit in the year that the Blas Aguilar Adobe may date back to.
C = The third digit in the year that the Blas Aguilar Adobe may date back to minus the number of bells you see on the plaque.
D = The number of letters that the last word in the main informational paragraph has.
E = The first two digits added together in the year that the Blas Aguilar Adobe may date back to.
F = The number of lines left below the main informational paragraph.
Checksum for A thorough F = 31