@CyanGamerGirl They are asking if they can get a Mansion to spawn in their world they already had made before 1.11 was released and then played in 1.11.
Another thing to keep in mind is the mansions only spawn in dark forest biomes, as well. That's one reason I like to have larger biomes in my worlds.
But once you are running 1.11, load up your world, go exploring for dark forest biomes, and then do as Bilbo Baggins would do. Climb up to the canopy and have a look around. From what I have seen in images and videos, the mansions do seem to tend to be taller than the trees in that biome.
If it is a world you have been pretty involved in, then you should have a feel on where the current boundaries are that you have explored. If you are already situated in a dark forest biome, then going a kilometer beyond where you have walked will put you in new terrain.
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In the real world, you stick your head in the dirt to hide from problems.
In Minecraft, you stick your head in the dirt to find problems.