Yes, this 2,699-square-foot condo in Back Bay has a library and a study (plus 3 bedrooms and 2.5 bathrooms). Never mind those, though. It's got a really wide living room/dining room combination—40 feet wide; all the more impressive, we imagine, given the view straight down through the foyer to the bay windows overlooking the Common. And Fido can scamper over the marble ahead of you—pets are allowed. Yours for $2,950,000.