Boston Drop 2

Our Boston Asset got a new puzzle:

In the far off land of the Highland sat an ancient Armory, a Center for Arts and other things.
Across the way lay Little Sisters.
The errant traveler turned right until they felt they reached a Low-
<part of this document is scribbled over with mathematical gibberish about what looks like a "System of Quine and Morse" or one of its other names>
A journey of just 8 minutes, you've reached your destination.
Find the plaque that this place is dedicated to.
Look high, look low.
Take a break and play some chess if your search is without merit.
The mayor provides the key.
RILRRTFGUHIKODYZSDYMTWMFRIQAKUYNUVQEAZFZYXWBRGUVHGAASCJVRNCSAMPFKQBRUNCHYVYKJVZGUYLRIFWCBKCITISSWSWIHVROSFWMPKSCIPJKUAHEEYFTL
If you've moved something blue, and your way is unclear, seek guidance for the opportunity may have passed.

Solution

In the far off land of the Highland sat an ancient Armory, a Center for Arts and other things.

The starting point: The Center for Arts at the Armory https://goo.gl/maps/EQipCxtPZLLia2958

System of Quine and Morse

Another word for this is 'Morse–Kelley set theory" and there is a Morse-Kelley playground:

The major named there is "MAYOREUGENECBRUNE" which also is a vignere key for the Code

RILRRTFGUHIKODYZSDYMTWMFRIQAKUYNUVQEAZFZYXWBRGUVHGAASCJVRNCSAMPFKQBRUNCHYVYKJVZGUYLRIFWCBKCITISSWSWIHVROSFWMPKSCIPJKUAHEEYFTL

decoding it to:

FIND A PLAQUE IN MEMORY OF FILLED WITH THREE CLOVERS ONE TEN TWO SEVEN TWO NINE TWO NINE THREE FIVE THREE TWENTYONE FOUR FOUR FOUR FIVE OPEN IT AND SEARCH

Boston Asset found this plaque:

using the number code in such a way that the first number gives you the line and the next number the letter this leads to

#row	#letter	letter
1	10	B
2	7	U
2	9	L
2	9	L
3	5	E
3	21	T
4	4	I
4	5	N

There is a bulletin board near the chess boards

Where we found Another notebook