Conversation so far:
What is Farnsworth House?
Farnsworth House is a one-room weekend retreat in what then was a rural setting, located 55 miles (89 km) southwest of Chicago's downtown, on a 60-acre estate.
How was Ludwig Mies van der Rohe involved with the Farnsworth house?
Mies van der Rohe designed and built the Farnsworth House.

Question: When was the house designed and built?
Self-contained rewrite: When was the Fansworth house deisgned and built?