When the attention of real estate speculators diverts, sometimes old neighborhoods have time to acquire a majestic patina. The Washington Heights section of northern Manhattan has been neglected for some time, but is now getting a fair share of spillover interest from Columbia’s Manhattanville project and the university’s nearby hospital campus. In 2009, the Audubon Park Historic District was created to protect the area just behind Audubon Terrace, home to the Hispanic Society and the Academy of Arts and Letters. But just north of the district, years of landlord neglect has unwittingly preserved row after row of early 20th century apartment buildings festooned with ornate cornices. But the cornices are now in danger of disappearing.