How to build a closet against a corner wall
What do you want to put in the closet?
Do you want a rod to hang up clothing, or shelves to store items?
Do you want a door on the closet, or no door?
Here's something that might work for you:
You might like this:
These freestanding kits come in several finishes, including different wood grains finishes.
This is for a corner pantry but can also be for a corner closet. Just adjust measurement for your needs.