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Our code is online at http://ci.vail.co.us. Refer to Chapter 12-13 ("Employee Housing"). Due to some legal restrictions in Colorado regarding rent control, we dont place sales or rent caps on "employee" units unless the Town is involved as the developer. Our code mostly deals with density bonuses for units that are occupied by local employees.
You are probably already aware of this, but Aspen/Pitkin County and Teton County, Wyoming are some really good examples of what you are looking for.