A builder in Gujarat developed a land parcel and made 20 plots.
Out of 20 plots, 1 plot was marked common plot and another marked common passage in NA approved plan.
Builder sold 15 plots to others to build houses. In sale deed they kept clause saying the plot holders will not have any right to common plot and common passage. And it will belong to the builder.
All property owners have a registered society and are claiming rights on common plot.
What should be the correct ownership of the common plot and common passage?