What is approx cost of contruction?

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Hello all,

Quite a newbie here and this is my first project so please help me out.  I have a piece of land for building a duplex in Denver.  It is for investment.  I am investigating how much it will cost to build a duplex.  

Fully understand that the construction costs varies depending on finishes.  I would like to get some insight as to how much approximately a duplex costs to build?

Basic specification - for each unit in duplex

-3 storey

-2500 sqft

-4 bed room, 3 bath

-roof top deck

-1 kitchen, 1 living, 1 laundry

What is the typical cost for a  building?  I cannot find any information on the internet and would like your help,

Thank you