Section 18(2)(b) in Maharashtra Housing (Regulation And Development) Act, 2012
(b)Where under clause (a) above, the promoter has formed separate and independent co-operative societies or companies or any other legal entities of the persons taking flats in different structures consisting of more than one building or wing within a layout, then the promoter shall form and register an Apex Body or Federation consisting of all such entities in the layout, within such period as may be prescribed.