Therefore, its known narrative elements are not a part of the Doctor Who universe as we, on this Wiki, choose to define it. It may have been the basis for a similar story in another medium, however — and that story may indeed be valid.
The Thirteenth Floor was to have been the fifth story of series 5 of The Sarah Jane Adventures. However, due to the death of Elisabeth Sladen in April 2011, only half of the series was filmed, resulting in The Man Who Never Was being the final story of the series. It would have resulted in Clyde and Rani (Clani) officially getting together as a couple, (DWMSE 32) having hinted them having feelings for each other before. (TV: The Empty Planet, The Curse of Clyde Langer, The Man Who Never Was)
This episode was potentially going to feature Amy and Rory, the first companions of the Eleventh Doctor.