1. What is the percentage normally a landlord takes to transfer the bill on the accommodation.
It depends on the situation and location and also prevailing circumstances. Generally the landlords demand around 35% and anything beyond that is exorbitant.
2. Can Mr. A go ahead with the transfer considering that he is staying in the premises alone for the last two decades or Does Mr. A need to take the consent of his living siblings and/or the heirs of his deceased siblings before proceeding with the transfer
Taking NOC at east from the surviving siblings would be a better idea so that a litigation in this regard that may arise in the future days can be avoided.
3. Are there any other complications
So long the procedures are followed there wont be any complication, however the siblings moods are to be taken care of properly.