I believe that the map on Adna's profile is accurate. The original farm started by Adna's pioneer father, Stephen, was Lot 24, and Adna added Lot 25. Adna dabbled in land speculation and also bought land in Kent County.
And yes, St. Augustine's sits on old Pherrill land which extends up to St. Clair and King Academy. It also extends down to the lake at Bluffer's Park.