build mobile app and web

I need App and website same this one [login to view URL] description if you are looking for land for sale in Saudi Arabia. the app will displays all Saudi real estates ads on Google Maps; navigate to the area you like and find your next land! you just enter the information for the land (address) then it will show you on the map features *you can search for a land in the map *it will show you the size there is a tool to Measuring the earth (with,high,,,,,,) Requirement it should connected to database for The Ministry of Municipal (i have it ) Control panel to add ,delete, edit ......... for both web and app the app should be develop for both Iphone and Android (web) time : 3-4 weeks