Service tax on house rent

Hi, I want a clause in my rental agreement to the effect that the owner doesnt have a problem in me carrying out any business activity in the premises. The owner doesnt have a problem with this but his legal team has advised that just having this clause will attract service tax on the house rent , even if the actuall business is not carried out at all, and that this will continue forever even after i vacate and somebody else moves in with no such clause. Please advise me on the exact position in such cases. Thanks a lot for your help.