addr:AddressNumberPrefix_type

The non-integer portion of the identifier for the house,
building or other feature which precedes the address
number itself, as defined by the official address
authority for the given jurisdiction. 1. This element
will not be applicable for most addresses. When
township-range or other non-numeric geographic index
references precede an address number, they are placed in
this field. The address number can then be maintained as
an integer for sorting and quality control tests. 2. If
necessary, the Separator can be used to separate the
address number from the prefix or suffix elements in
constructing the complete address number.