addr:StreetNameModifier_type

A word or phrase that precedes or follows all other
elements of the street name and modifies it, but is
separated from the street name by a street name
pre-directional and/or pre-type.
The street name pre-modifier is rarely needed and its
use should be minimized. The modif ier can be included in
the Street Name element unless it is separated from the
street name by a pre-type or a pre-directional.