I see your problem first u see old plan pass copy of your flat and as per plan pass what's the area of your flat. Then the open space / garden space / parking space in front of your flat is your name in record and society give any documents for that OR u give any application for right to use this space? and Society give any permission for right to this space / land to u? IT's very difficult for u, So in your case first u see the new plan pass copy as per redevelopment and choise your flat OTHERWISE u give a application / notice to the society with objection for tha redevelopment and file a suit against society. Majority memebers r ready for redevelopment the buiiding so what can u do so u give first notice or application to the society.
Note : - U say that i see new plan pass copy of the redevelopment and u give me a first choise for our flat and u ready for that i m agree for redevelopment. And that time u make a Understing deed with Society and The Builder / Developer.