Applicability of GST on renting of immovable property

We are registered dealer in Rajasthan and provided office building which was situated in Rajasthan on rent to a person who registered in state of Delhi, so in this case IGST applicable or CGST & SGST applicable.
if the tenant is having considerable income generation in rajasthan then he could get regn in that state also. otherwise whatever gstthe landlord is charging IE cgst+sgst will be cost to the tenant and not eligible for input