This July 17, 1968 engineering drawing of the Beaverton and Sunset campuses details information about the building size, power, and water along with the date of construction.

What is interesting is it shows building 50A  as "To Be" in what is the parking lot just south of building 50.

Of course 50A was never constructed and the next major building on the Beaverton campus was 58 just to the west of 50. Click on the image to view the full scale drawing PDF.