Advice on realistic $/sqft for building a duplex (or 3) in Denver

[Patricia Miller]

I'm looking at a property with an existing structure on 1+ acres west of Denver. Sewer/Water/Gas already available, zoned R-2. The land would accommodate subdividing to create 4 lots permitting a duplex on each one or 3 duplexes + one SFR. The corner lot is flat. What is a realistic price per sq ft for new construction in this area -- especially if 3 identical duplexes were built? And how difficult do folks think it would be to find available builders/contractors to work on the project?