Hi,
Elba St, Ayr (St Quivox) exists and can be viewed on Streetview. However the present properties appear to date from the early fifties, up to the late 70's, with all the old turn of the last century housing having been demolished.
The 1855 Ayr Town plan (Ref
http://maps.nls.uk/geo/explore/#zoom=18&lat=55.4652&lon=-4.6237&layers=54), and the later 25" OS (1892-1905) plan indicate that the bulk of this earlier housing was tenement property.
These buildings, often two storey with four separate flats, and sometimes as high as four storeys with twelve or more separate dwellings, depending on demand, available funding and/or local authority byelaws. Adjacent, contiguous buildings were frequently funded and built by different developers, and often the buildings were named after their respective developers, eg Nelsons Land, Stewarts Land etc.
If the ground required for the modern housing was compulsorily purchased by the Local Authority (Ayr Burgh, latterly Kyle and Carrick District Council, or South Ayrshire Council), records of the purchases and former ownerships may exist in South Ayrshire Council files or Archives.
Regards
Istrice