A Madison Avenue antiques dealer is suing a group of unidentified homeless people for $1 million, saying that the group has taken up residence outside his posh Upper East Side business, using the sidewalk in front of the shop as a urinal, spittoon and occasional dressing room, according to court papers and a lawyer for the businessman.

Karl Kemp, owner of Karl Kemp & Associates at 833 Madison Avenue near 69th Street, said he had put up with the crew of vagabonds, one homeless man and his “island” of filthy belongings in particular, for more than two years and that he hoped the suit will force the city’s hand in taking measures to have them removed.

Mr. Kemp said the police have not made the issue a priority and that local merchant and homeless organizations have not budged. More so, he said, the homeless people seem content making their digs out of space uncomfortably close for him and his customers.

The suit notes that Karl Kemp & Associates is located “within the heart of New York’s most exclusive Madison Avenue shopping district,” with neighbors like Gucci, Chanel and Prada.