sentences:  When Isaac Newton Phelps died in 1888 he left 229 Madison Avenue (plus a million dollars), to his daughter Helen Stokes.The building was extended by architect R. H. Robertson in 1888, adding an attic floor and an extension in East 37th Street that doubled the size of the house.This remained the New York home of the Stokes family until they sold it in 1904 to Mr. J. P. Morgan and moved back into 230 Madison Avenue.