Old tenents rights

Hi Mr Gunjan I hope you are doing well. We have a medical store which is on paghdi, it is with us since 1990. There are other three shopes under the same agreement. now we have made new furniture and forgot to tell to our owner now owner has came to us and asked that you didn't took our permission. Here my question is can Owner creates any legal problems to us? Also heard the roomer that he wants to sell this whole property to someone else who is like don , can it will be a problem for us? As we are regular payer of rent which is 300RS, we do receive the receipt of rent and property tax of the property with light and phone bill on our name. Thanks Ankit