What is the ruling on taking financial compensation for vacating an old-lease apartment for one of the landlord's heirs, and did Sheikh Usamah Abd Al-Azeem Hamzah issue a fatwa permitting this action?

The old rental contract is Islamically void due to the injustice it inflicts upon landlords and the unlawful appropriation of their wealth. Therefore, the aforementioned rental contract is فاسد (null and voidable) and cannot be inherited from the deceased. The brother has no right to demand compensation for returning the apartment to its owner, as his demand constitutes aggression and unlawful appropriation of wealth.