Sharing of revenue

A AND B ARE PARTNERS IN FIRM DOING BUSINESS OF RESIDENTIAL HOTEL AT MUMBAI.HOTEL BUILDING IS ON THE NAME OF PARTNERS..EARIER THEY WERER CHARGING RENT TO THEIR PARTNERSHIP FIRM FOR USE OF PERSONAL BUILDING .THEY WERE CHARGING GST 18% TO FIRM.NOW THEY WANT TO MAKE AGREMENT WITH THEIR OWN FIRM FOR REVENUE SHARING THAT A WILL GET 45%,B GET 45% AND FIRM GET 10%.WHETHER  THERE IS ANY GST TAX LIABILITY ON SALE REVENUE SHARING,ON BUILDING OWNERS