According to the floor plan, the den in my new condo was supposed to be an open square without obstructions. Now that I have possession, I notice there's a square wall in one of the corners taking up about 4 square feet. I spoke with another owner on the same corner of the building and apparently the space is occupied by a vent, so there's no removing or changing it. I'm not seeking legal advice, but what happens in situations like this? Any real estate folks kicking around??