sentences:  The Beekman family lived at Mount Pleasant until a cholera epidemic forced them to move in 1854, but the home survived until 1874, when it was torn down.With the surge of immigration from Europe in the late 19th and early 20th century, the Lower East Side's slums expanded north.The Beekman Place area's well-off residents gave way to impoverished workers employed in the coalyards that lined much of the East River.