1) what are the clause s in your sale deed?
2) did the brochure forwarded by builder mention that only 37 flats and 18 shops would be constructed
3) builder needs consent of flat owners to carry on additional construction
4) if you grant consent builder can carry on additional construction
5) you can file suit and seek stay of additional construction if no permission has been granted by flat owners for carrying on additional construction
6) file RTI with muncipal corporation as to on what basis permission has been granted to carry on construction without flat owners consent