Kindly consider the following. The door to a Masjid is on a platform. To exit with the left foot is sunnah, however it is also sunnah to ascend to a high place with the right foot. What should one do in this particular case?
Answer
(Fatwa: 1816/1190/H=1432)
You should stand in the last portion of the Shariah mosque and come out with your left foot ahead and keep it on your shoe then put on your right shoe and then your left shoe. No matter if the door of the mosque is on the platform then too the sunnah method is what was mentioned above.
Allah (Subhana Wa Ta’ala) knows Best
Darul Ifta,
Darul Uloom Deoband