Gst regular to composition having two business

My clients is registered Regular GST TIN holder Proprietorship having business of  1] Mfg of Cakes & Pastries and reseller Shop which have turnover in 2017-18 Rs.19,00,000/- and 2] Own Commercial Property Rent Income yearly in 2017-18 Receipt of Rs.12,00,000/- .  He now want to opt for Composition Scheme.   Is it possible this for Propertship having two separate business income and Rent Income .  OR whether I have to take separate GST TIN no. for Composition and for RENT receipt with Regular GST No.  Question arise how and can I cancel or opt for composition for business income.  Favourable reply awaited.