Gst impact: rental income from residential property beyond r

Can any one explain “Rental income received from residential house is exempt. But if you have given your unit to commercial enterprise, then it is taxable if you are getting more than Rs20 lakh as rent,” agreed what about if income received from business both are added up more the 20 lakh you have to pay GST or you have to pay gst ofr business income and no need to pay gst for rental income....