New Yorkers have had fun watching the progress of New York magazine writer Julie Baumgold since her husband, ex-Newsweek chief Edward Kosner, became New York's editor. The biggest groan from insiders was heard earlier this month with publication of the cover story about Richard Nixon in retirement by Baumgold, who also happens to be one of the magazine's most diminutive staffers. The fashion feature in that issue: a spread on clothes for short people . . . Q: Why didn't the regular golfing writers for The Washington Star cover the Kemper Open? A: Because a couple staffers were paid to write features for the tournament program. They were ordered to return the cash and forgo covering the event.

September is the publication date of Regardie's Business & Real Estate Washington, the bi-montly magazine that replaces Real Estate Washington. The first world in the new title refers to Bill Regardie, not one of your low-profile types; he's the husband who bought the $5,000 full-page newspaper ad in The Post to herald his wife's birthday and their wedding anniversary . . . Urban Lehner, Washington labor reporter for the Wall Street Journal, will head the Journal's Tokyo bureau after a summer wedding to attorney Nancy Leonard.