Flat in dombivali grampanchayat

Hello, I am planning to bua 1BHK flat at Orchid Residency, Desale Pada, Behind Sidhivinayak Bhavan. Builder is Sai Developer, This is 4 Building complex, Each building is having G+7 floor. Builder is saying property comes under Zilha Parishad. Builder is saying we have a Collector NOC. But according to my knowledge, Gaothan property have the permission only for G+4. So Kindly advise on the same, What other documents i need to check.