Banks as financial intermediaries play an important role in facilitating the economic cycle. The implications of the bank’s investment in the housing sector in Iran's economy, which is prone to Dutch disease, is a concern of the present study and we have designed a Keynesian dynamic stochastic general equilibrium model for it. The results of the model, which confirm the Dutch disease during a positive oil shock, suggest that banks' investment in the housing sector when production in the economy is growing and the amount of concessional facilities has increased, is a well-accepted and profitable. The positive shock of labor productivity in the manufacturing sector and the shock of monetary policy will put the economy in a position where production in the economy will increase and banks' investment in the housing sector will be profitable. But in a space where production is declining and the size of the granting of bank facilities is decreased, as the economy faces a positive shock to labor productivity in the housing sector or a positive shock to oil revenues, the freezing of banks' assets in the housing sector has not been favorable and, furthermore, putting them at risk by reducing profits and falling capital in banks.