the version of the ORD map that i had linked to, from the USC Digital Archive site, is actually an altered version of the original map. (the 1st indication of this, is that the streets are labeled with current names, such as broadway instead of fort street, and bunker hill being labled as such.....hell in 1849, Prudent Beaudry hadn't even settled in to town yet, and the centennial of the boston battle which the hill is named for wouldn't happen for another 26 years!)
a proper representation of the ORD map is here
Source: LAPL
http://jpg3.lapl.org/pics36/00067714.jpg
without the added verbiage, the compass center seems to be placed at the front door of La Placita Church,which fronts onto the plaza.
i'm not buying any of what the 1950 proposed plan is selling quite yet
