A group of New Yorkers is pushing for landmark status for Tin Pan Alley, a series of four-story row houses on West 28th Street between Broadway and Sixth Avenue that used to be home to the publishers of “God Bless America,” “Take Me Out to the Ballgame,” and other famous songs. The buildings were put on the market for $44 million this fall, but a plan to replace them with a high-rise fell through as the economy slowed. Preservationists, spurred to action by the construction plan, are now hoping the city’s Landmarks Preservation Commission will grant the buildings landmark status. The commission said it is researching the buildings’ history before making a decision.