Hi Ammack,
South Mains Street was demolished some time in the 1960's. It could be argued that at one time it was the most southerly street in Whifflet. On the west side of North Road, it ran at right angles to the main A725 Coatbridge to Bellshill road. It was parallel to, and to the south of Hospital Street. Margaret Street joined the west end of S.Mains Street to Hospital street.
The buildings comprised, if I remember correctly, two storey brick tenement properties on both sides of the street. The tenements on the south side had an open outlook to the rear (Goatfell on Arran on a clear winters day), and those on the north side of the street formed the south side of the rectangular development that was known locally as "The Big Building". This series of tenements stretched along the full lengths of S.Mains Street, north along Margaret St, east along Hospital St, and south again on the A725 to rejoin S. Mains Street.
No 24 would have been in this building, as the houses were numbered odd to the left, even numbers to the right, commencing from the A725 end of the street
The following reference should take you to a 1947 map of the area
http://maps.nls.uk/view/82892073. (The west end of the street is on
http://maps.nls.uk/view/82891956)
South Mains Street is near the west edge of the map in the NW corner area, and your aiming point is the Rosehall Institute building.
Sorry I don't have a photo, but I'm sure that there will be one on one of the Monklands web pages.
Regards,
Istrice