The church architecture is notable as an example of the adaptive reuse of an early twentieth-century estate carriage house; it has been substantially renovated over the years for more serviceable ecclesiastical means.

Eventually St. Agnes acquired the estate of Alexander Dommerich, known as Wildwood Farm.

In January, 1967 a spectacular fire destroyed the 50-room main house of the estate, built in 1917.

After this fire the estate's six-car garage with chauffeur and supervisor's quarters, known as the Carriage House, was converted for church use by William DeLuca.

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