For the Triple Lobby you need to put it on the 1st, 15th, or 30th floor. Click the lobby and hold option and shift and click on the 1st, 15th, or 30 th floor and boom. You will have the 1st, 2nd, and third floor lobby's. You could have it on the 15th, 16th, and 17th floor. You could have it on the 30th, 31st, and 32nd.