DaCor
Did a bit of digging on this. 1 to 3 were originally planned for here but this was changed in a later planning application, linked below

https://geo.galwaycity.ie/ePlan5/AppFileRefDetails/97664/0

Going off the planning docs from the late 1990's it looks like 1 to 4 are block 1, 5 to 8 are block 2 and so on.

No idea how to map this but the current way its mapped is 100% incorrect though. I'll have a think about this one