Title is self-explanatory.

In the first area of Freeside, just after you enter on the left. Big yellow building with a wooden sign.

Go to freeside, walk past The King's building. You'll go through the blue bus doors and after that the Mormon Fort is straight ahead, the door is very easy to miss but you turn to the right and there should be a sign it front of it and the door is a wooden door that blends in very well with the wall..

Ok thanks, I thought it was like in a remote place or something, not in the Vegas area....