At the posted coordinates stand with your back to the pole. You will be facing two identical "No Smoking" signs. One on the right, one on the left side of the front door.
Count the LETTERS (Just the letters) on only one side (of the No Smoking message only) and subtract 18 from that total for a value of "A".
Clue to the next stage is calculated as follows: B = A * A
C = A (reversed)......Example: if A is 19, then C would be 91
Stage Two, Final = (B + C) - 4.42
When you get there be sure to step inside the door and say "Hi" to the guy sitting to the left on the bench. This same guy is there everyday reading the same book! Must be nice to have nothing to do but read!
Some will find this cache very easy, others may not. Please do not post any spoilers in your log.