Photos and video from the Detroit set show "Sam" and "Carly" as they jump to (or from) a patio facade to Transformers-ish object. They also showed "Dylan" hanging around another building facade. Makes you wonder if part of the purpose of the blue screen isn't just for completing the CGI look of the probable Transformer but to also merge scenes filmed at the "penthouse" with the Detroit footage.
Also, below are more images from that day thanks to Surge29. They show more of the object and building facade filming along with a look at some of the TF vehicles. For the last pic, it is basically a screenshot from my email as for whatever reason the email format was determined to only show the pictures as thumbnails and I couldn't download the full images. Surge29 also tried to get a look at what was being stored in a building but turned away by security. Does make you wonder what goodies we have not seen yet.