For part of its length, Margin Street runs behind a narrow linear park along the Pawcatuck, with Connecticut industry on the opposite bank. The most important house on the street is the John Lewis-Captain William Card House ( WE10.1; c. 1720; 1929–1930, restoration, Norman M. Isham), at number 12, a central-chimney house with flank gable roof raised on a stone basement. Two Neo-Colonial houses ( WE10.2, WE10.3; c. 1873, c. 1896; c. 1840, 1900), at 2 and 4 Margin Street, both turn-of-the-century reworkings of mid-nineteenth-century dwellings, merit a look. Number 2 began its existence as a Second Empire house with large cupola centered on its mansard roof, while the appeal of number 4, with its attentuated, semielliptical porch and dormers, results from the reworking of a Greek Revival house.