What is the ruling on dealing with a usurious bank that constructs a property and benefits from a portion of it in exchange for the construction, and what is the ruling on a father benefiting from an apartment in this property if it is by court order despite his initial refusal?

It is not permissible to accept a usurious bank's offer to build a facility for it if it will benefit from it in what is forbidden or in what is connected to its usurious activities. This is because it involves assisting in what is unlawful, and because the means take the rulings of the ends. However, if the portion designated for the bank is for a permissible benefit that has no connection to what is unlawful, then there is no harm in the transaction, based on the view that it is permissible to deal with those who possess ill-gotten wealth. Your father must reject the offer if it is unlawful, but if his brothers overpower him, there is no sin upon him, and he is not obliged to forgo his right to construction and benefiting from the apartment allocated to him.