My family owns a commercial property in Bangalore. Its a business hub locality. The property was bui

My family owns a commercial property in Bangalore. Its a business hub locality. The property was built way back in 1975 by my grandfather and since then its the shops in my building r let out for rent . Now the tenants are paying very less compared to the area's rental value, if we ask they scare us by saying "we are tenants since the building was built so you cannot demand more if demanded we'll pull you to the court and that will take 3 years and you will suffer" this is their reply. also these tenants do not have running agreement all the agreements have not been renewal.