As others mentioned, there is no way to estimate the cost of a project like this without more information. How big is the lot & existing property.. what type of new build will be going up, what area its located in, what types of materials will be used... way too many variables for any of us to even begin to give a clear answer. Your best bet is to contact a few different contractors and have them give you a bid. If they want the work they should be able to give you a clear idea of what it would cost. Good luck!