Chelmsford Glass Works' Long House
 The Chelmsford Glass Works' Long House is a historic tenement house at 139-141 Baldwin Street in Lowell Massachusetts. The building built in 1802 by the Chelmsford Glass Works to house some of its workers is a series of 1.5 story Cape style wood frame houses joined into a single structure. The building is one of the earliest industrial tenement structures built in the country.The building was listed on the National Register of Historic Places in 1973.