Hi again,
I've had an answer, and as I thought, Town foot (Town-foot/Toonfit) was at the bottom of Church Street around the Merchants Close area.
You can see Merchants Close on Google Street View. I am told that the Poor Law Hospital was there and also a barn there was used in 1786-7 by the Relief Church until the Church now known as the East Church (Church of Scotland) was built.
Merchants Close is situated at the rear of the present West Church (Church of Scotland) which opened in 1901 and its Hall (which was the previous Church!) and borders Glentyan Estate.
Hope this helps,
Carolineasb