Corner of 723 US-422 (New Castle Rd / Benjamin Franklin Highway and Whipperwill Rd. You can just see the tip of the roof of the house across the street (703 W Old Rte 422, Butler, PA 16001) which is Diehl Accounting in 2019. These bldgs still stand in 2020. The low bldg on the left is painted blue.

There is a great, very clear 1965 image of this spot Photo 61-KBU-30
https://vintageaerial.com/photos/penn...
A visitor to that image identified this as Dr. Bachman Veterinary, Rt. 422 Mt. Chestnut, PA