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You didn't tell where the "proper co-ordinates" of the Unique objects to be found.

Anyways, since you seem to know how to place them, after a glance at t_ginza.hood:

there's t_ginza_rd_48_x, unique_component 0, it's the owner of
instance_component 1253 for example (and 4 other instances)

I assume, that instance has the (relative?) position -270.760834 0.195346 271.849213.
So I guess you need to place that instance relative to it's owner (whose position you know from what you wrote).

InstancePos = ownerPos + relPos (vectors)