A few from the chapter website, but no good full shots of the house:
The deck was on the back of the house and, from what I remember, kind of stacked to where there was one deck and then stairs up to the deck on the next floor, etc... The decks were maybe 10x12? Maybe a little larger? I don't remember exactly. They probably had added on at some point, I believe most of the chapter houses at Iowa had additions to them due to growth in the 80s.