As previously stated, two-story houses can and have been done in the past and were ADA accessible. From what I've read Yeti, House of Horrors in Hollywood is two-stories.
Secondly, I read on another site that Shadybrook and one of the blueprints look very similar. They posted this image to compare the two:
There is definitely a large similarity between the two.
Lastly, I've been wondering a little more about the lantern after the latest update. I'm curious to find out if there are more hidden images in the latest lantern change. Another thing I noticed was the lantern seems to have something sticking out behind it. I doubt it is anything but you never know. :shrug: