You have indeed found it JW, but you need to look at the older GSV image to see the building.
Grandarog knows more about this place than me, I believe. After Borden Grammar School moved to its present location in Sittingbourne in 1929 it became the Kent Farm Institute, that later merged with other similar organisations and moved to the present Hadlow site. Latterly it was the Adult Education Centre, and now destined to be converted into flats.
There is You Tube video from the Sittingbourne Heritage Museum about it, but finding it again to link to it defeated me....
I attended BGS between 1962-9 so a bit of its history has been there ever since. That and we frequently zoomed up and down Borden Lane to either the Maypole at Borden, or the Sun at Bredgar. Mind you zoom is a relative word in a Morris 1000! Riddles Road was also a short cut to College Road where we would be on an absolute curfew to get a couple of young ladies home. Happy days