Staircases take up a lot of space, so why not use them for storage as well. Imagine each step is a box with a hidden drawer in it still allowing for additional storage or home office space beneath the staircase.
Hook a little Lego onto your keychain, and never lose your keys again! TESTED: this only works for not losing keys where there is a Lego board on the wall or somewhere conspicuous. Lost my keys at the office.