A federal judge has ruled that Philadelphia Newspapers Inc., the publishers of the Philadelphia Inquirer and Daily News, have the right to refuse advertising from an apartment locator service because it has a longstanding policy of rejecting ads from competitors and there was no proof that it was attempting to establish a monopoly for its own subsidiary apartment locator service.

In an 84-page opinion handed down late yesterday in The Apartment Source of Pennsylvania v. PNI, U.S. District Judge John R. Padova found that the “relevant product market” is the market for apartment rentals — a market that is “teeming with competition” in the Philadelphia area.