Aha! Found out what the mystery building is. From the flyer:
What is a porch to you? How do you use porches? Yesterday I asked what you thought this construct was. I got a lot of responses, all imaginative, and many, that were not what I was aiming for, but do contain many of the characteristics of space that I intended. My answer to “What do you think it is?” is a double-sided porch. In this building I wanted to create a space that captured the iconic quality of the southern porch, without building a replica. In this case there are two porches back to back to each other. In order to understand more fully how to capture the essence of a porch, I need to know what porch is to you.