Gst on rental for a propertior

Hello,
I am a partner in a partnership firm and our turnover is much more than 20 lakhs and thus my personal income is also more than 20. Now, I am renting out a property for 1 lakh a month. I don’t have a personal gst number. Now whether I am exempted from gst as my total rental income is less than 20 lakhs ? Or do I have to take separate personal gst number and pay gst on rent ? Also can I club this rental income in my firm ?? Thanks