The Developer has to take Development Agreement and General Power of Attorney to Develop & to sell his share of the developed Property .
The Document will be in the nature of Agreement for Development and GPA in rspect of the Developers Sahre/ allocation .
In Your message Agreement/Document particulars are not in detail .
The Stamp Duty has to be paid on the Development Agreement and General Power of Attorny .
The Development Agrement also contains the GPA in repsect of the Developers Share /Allocation , if it is the GPA is not there , the owner has to join in the sale Deed along with the Developer
For Registration Office Assitance and Stamp Duty particulars pleae visit https://igrs.ap.gov.in
Y V Vishweshar Rao -Advocate Warangal- AP