Built in idea for the dining room door! Oh how I love built ins. Ikea Shelves Into Built-in Bookcases :: I really love this. You could turn any room into a library with this idea. And you don't need ikea for it, either.
Small house w two suites. Consider adding coat closet on wall outside bathrooms, rolling bookshelves or other temporary dividers btwn living + dining areas. Make a window seat banquette for built-in dining to save space.