From the NY Times:
The New York Appellate Court on Thursday unanimously upheld the landmark status of the City and Suburban First Avenue Estates on Manhattan’s Upper East Side. In 2006, the two tan-brick apartment houses were designated a landmark, even though the owners had reclad them in reddish-pink stucco, drastically changing their appearance.
“The two buildings clearly have a historical significance that justifies their designation as landmarks,” the court said in its decision.
What happened to the "historic fabric being too altered" to be designated? Oh, wait, this is on the Upper East Side. Different set of rules. My bad.