Back door! where is the back door

Yesterday Madhu is asking Sultan to leave from back door so rk won't see him some people saying he should have done i am sory but Rk live in penthouse in top floor some where because we have seen them taking elevator before to go to his place so for i have seen only one entrance to that place everybody come ad goes from there only so how would sultan goes by not noticing by any one when everybody is standing in front of the door sometimes cv's make ridicules bloopers