Question: When was the stratosphere hotel built in las vegas?
qaPairs: question: When was the ground breaking for the Stratosphere Hotel?
answer: November 5, 1991
question: When did construction begin on the Stratosphere Hotel?
answer: February 1992
question: When did the Stratosphere Hotel open?
answer: April 30. 1996
qaPairs: question: When was construction started on the stratosphere hotel built in las vegas?
answer: February 1992
question: When was groundbreaking on the stratosphere hotel built in las vegas?
answer: November 5, 1991
question: When was the stratosphere hotel opened in las vegas?
answer: April 30, 1996