The Alien Runs For Mayor Mystery Cache

You will be gathering clues to the final cache from two structures located on a corner appropriated named Strohman Park.  One is on a large stone planter donated by Jerry & Marilyn Hardacre.  The other is on a monument dedicated to fireman, Lieutenant Marvin Strohman.  The final cache is not at or near this inital location.

Park in the public parking on the west end of this block.  Approach the northeast corner where you will see Strohman Park.  At the corner gather the information from the large stone planter which has Marilyn Hardacre's Mayoral term:

Term of Mayor Marilyn Hardacre:

ABCD - EFGH

Now turn your attention to the monument of Strohman Park. 

When did Lieutenant Marvin Strohman die in the line of duty:

I - J - KLMN

You now have enough information to solve for the final cache location:

N 44 J (G-D). (I-N) (M-G) (N-A)
W 90 (G+J). D (N+E) C