1. For GST registration you need to check aggregate turnover of the assesse and limit is 20 lakhs for Services and 40 lakhs for goods only subject to certain states
2. aggregate turnover - income from all the business/activities carried out under the same PAN will be added subject to some conditions and exemptions like salary income
3. in above case both the incomes (rental + business) will be added to check the limit
4 .rental income from residential property is exempt from GST but still be added in aggregate turnover.
hope this helps.
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CA. Aditya Goel
Aditya Goel & Co, Chartered Accountants