one would think this building has a existing 240/120 service or already has a transformer for the 240/120 loads? most 480 volt services this small I have ever run into was an added service where the building already had a single phase 240/120 volt service, so if the equipment can not be converted to 480 which most German manufactured printing presses wont have this option, just sizing a transformer to what equipment he already has and then run the rest off the existing 240/120 volt service unless its too small, but then he has the option of also installing a smaller 240/120 volt transformer to cover the needs for any loads that exceed the existing 240/120 service, the only problem is if this building already has a transformer off the 480 to feed the existing 240/120 volt loads then this has to be added to the existing 480 service.
Here are some facts, installing a transformer sized for the max now will lead to much higher electric bills for the extra wattage that the transformer will use because it is not fully loaded, your better off only installing what you need now and maybe enough to cover what is planed in the very near future, then down the road you can always add transformers as the load and equipment expands.
This is why it is always better to put the transformers on the utility side of the meter, but in existing cases then just install what is needed and add as they expand.
Also if you do decide to go with a 4-wire delta 240/120 then install a single phase panel fed from A and C phases then install a 3-phase panel only for the 3-phase loads this removes the risk of someone landing a 120 volt load on the B phase.
