Space or clutter?
Now the last thing you want to do is make a space look smaller, especially one that may be quite small to begin with ahem wink Toronto and Vancouver condos. However, clutter is worse! So let's say you have a lot of books 'cause let's face it reading is a beautiful thing for the mind and soul. You like to collect books and you are not going to adapt to reading on an iPad or Kobo. So in a case like this opt for the built in bookcases or regular bookcases. Sure you don't want it protruding the extra foot from the wall but it is the better alternative to having your books in boxes around your condo. Nothing makes a condo that someone lives in look better than it being clean and organized!
(pictured here Ikea HEMNES bookcase)