GST on interest payable to Greater Noida Authority

As per notification 12/2017 CT (r) Sno. 27 , the interest is exempted , so i dont think that Authority will charge GST on interest

BUT I DON'T THINK THAT INTEREST PAYABLR TO AUTHORITY FALLS IN THIS EXEMPTION HEADING

Services by way of— (a) extending deposits, loans or advances in so far as the consideration is represented by way of interest or discount (other than interest involved in credit card services); (b) inter se sale or purchase of foreign currency amongst banks or authorised dealers of foreign exchange or amongst banks and such dealers

Yes , interest might be exempted as on lease primium there is no GST , but interest being charged by authority is sort of late fee in shape of interest .
As per section 15 CGST such interest & late fee is added to accessible value , but your lease primium is exempted so the interest paid on same might be exempted.