There is a popular misconception that RERA registration applies to the entire project including the rehabilitation component, which is not the correct legal interpretation of the provisions of the Act, rules Maharashtra Real Estate Appellate Tribunal
The Maharashtra Real Estate Appellate Tribunal (MREAT) has ruled that the rehabilitation part of a redevelopment project does not require registration under the RERA Act, 2016, if it does not involve marketing, advertising or selling. Hearing a plea by a resident of Bandra in Mumbai, the tribunal said that unless and until there is a sale or publicity or advertisement, the registration of a rehabilitation project is not required, and therefore, provisions of RERA (Real Estate Regulation Authority) Act will not be applicable for such projects.
https://www.moneycontrol.com/news/business/real-estate/no-rera-registration-required-for-rehabilitation-part-of-redevelopment-projects-in-maharashtra-tribunal-9044871.html
Source: Money Control