Chicago Opera House
... that the Cobb and Frost-designed Chicago Opera House, built 1884–85, was one of the first buildings constructed using general contracting?
... that the <a href="./Cobb_and_Frost" id="mwHSY" rel="mw:WikiLink" title="Cobb and Frost">Cobb and Frost</a>-designed <b id="mwHSc"><a href="./Chicago_Opera_House" id="mwHSg" rel="mw:WikiLink" title="Chicago Opera House">Chicago Opera House</a></b>, built 1884–85, was one of the first buildings constructed using <a href="./General_contractor" id="mwHSk" rel="mw:WikiLink" title="General contractor">general contracting</a>?