The "Big House" was designed by the prominent Cleveland architectural firm Hubbell & Benes.  Unlike the Classic Revival style homes ususally associated with plantations built during the period, Millpond was constructed in a California Spanish revival style.  One of the most distinctive features of the 38,000 square foot structure is Millpond's atrium.  It is constructed of large retractable glass roof panels that open and close with the season, providing protection to the indoor garden below.  The house consists of 11 fully-appointed bedrooms and 10.5 baths, all of which are accessible via the loggia flanking the indoor center atrium.

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There are numerous other period buildings in the main complex including two guest cottages with five additional bedrooms, a coachman's cottage, three gatehouses, stable, water tower, barns, and a 36-run dog kennel.

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The elaborate grounds were designed by noted landscape architect Warren Manning, who apprenticed under Frederick Law Olmstead, and who also designed the intricate grounds of the Biltmore Estate for the Vanderbilt family in Asheville, North Carolina.