TWO STORY ADDITION, UNIVERSITY PARK, MD: “There’s something out there,” they said at our first meeting, “we just can’t tell what it is.” A brick monolith with midget windows divided the house from the yard, so we punched some larger openings through the wall and terraced down from a treehouse sitting room - to a step-down family room - to a deck - to a patio. Now the house and the yard share common ground.