Hi sir/madam,
the scenario is Mr A and Mr B who are owners of Site , gives GPA (1) to Mr C and they mention in GPA (1) than GPA holder can execute further GPA to developer (D1) for development of sites and give complete sell authority to D1.
Now D1 develops flats on site and sells Flat to others and signs sale deed too.
Let me know if this is valid transaction
Regards,
Amit Jain