Building WP is Walnut Park Complex, (45.4567 -122.6612)
John Addis says:
Walnut Park Complex was the light assembly manufacturing and later engineering building near the corner of N. E. Union (later Martin Luther King, Jr. Blvd) and Killingsworth according to the January 25, 1980, issue of TekWeek. I have no phone book for the era which lists a name for the building. The exact location of the building is not known to me, but the coordinates given are for a likely building near the corner. The facility was probably short-lived as I find no reference to it six years later in the March 1986 Tek Communications Directory.