Further to the history of Don Mills and Lawrence, my recollections are reinforced in the "Illustrated Atlas of The County of York" ISBN 0-919302-35-1 which is a reprint of an 1878 Atlas and in "Pioneering in North York" written in 1968 by Patricia W. Hart for the North York Historical Society.
I am sure both books are available in Toronto libraries.
The aerial photograph posted is as I recall the intersection, the Watson house with outbuildings as you would expect in a rural home occupies the NW corner and the school on the East side of Don Mills south of Lawrence. This school is the second Don school, the first was a half mile north on the Hogg property.