I'm not sure that mapping this as a street name is correct (but you may want to ask for a second opinion). A terrace really a name for the building rather than the street, which is why a terrace is only usually on one side of a road. The tag https://wiki.openstreetmap.org/wiki/Tag:building%3Dterrace exists for it. So I'd expect that to be applied to the building, with the terrace name added to the building rather than the street. 