Robert Moskowitz, a painter who used the New York City skyline to stake out a unique position on the border of representation, died on Sunday at the age of 88. His son said the cause of death was from Parkinson's disease. He made a series of similar works after he exhibited some of them in the Museum of Modern Art. The views of empty corners were a constant feature of Mr. Moskowitz's work from the mid-1960s into the '70s.