From CNN/Money:

Housing crunch, 90210

Across the country, real estate agents and home sellers in wealthy neighborhoods who grew accustomed to seven-figure bidding wars during the boom are feeling the sting of the housing crunch.

Ed McMahon can vouch for that. The former Johnny Carson sidekick and TV pitchman recently saw his $5 million Beverly Hills home go into foreclosure.

In fact, McMahon is a celebrity face to a broader trend.

Three of the nation’s richest zip codes saw particularly steep home-price declines in the three months ending April 30, compared with the previous three months.

In Palm Beach, Fla. (zip code 33480), median home prices fell 38% during that period, according to the real estate Web site Trulia. Prices in Greenwich, Conn. (06831), dropped 15%, while homes in Wayzata, Minn. (55391), are selling for 28% less.

Prices in other wealthy towns also declined: Gladwyne, Penn. (19035), was down 6%, and Beverly Hills (90210), Lincoln, Mass. (01773), and Ladue, Mo. (63124), each slid 2%.

“What I’m finding is that million dollar plus homes declined 4% or so [over the past 12 months],” said Don Kelly, a spokesman for Zaio, which is building a national data base of home value appraisals.

And foreclosure data tracks the pricing information. In Beverly Hills, filings nearly doubled to 41 in the first four months of this year, up from 22 in the same period last year, according to RealtyTrac, which compiles foreclosure stats. In Palm Beach, there were 34 foreclosure filings, up from 9 in the period a year ago. Greenwich had 23, up from 10, while Wayzata had 18, compared with 14 a year ago. Kenilworth, Gladwyne and Medina had just one each, while Lincoln had none.

But many ritzy areas are finding they are not immune to the housing slowdown.

In the Philadelphia suburb of Gladwyne, the wealthiest town in Pennsylvania which lies along the fabled “Main Line,” the market has also slowed, according to Judy Getson, the sales manager for Prudential Fox & Roach in Haverford.

According to Trulia, just six homes sold in Gladwyne during the three months ending April 30, down from 14 sold in the same three months during 2003, a boom year. There are now 42 homes in town on the market for a million dollars or more, according to Realtor.com, ranging from $1.195 million to $17 million.

Getson is seeing a downsizing phenomenon similar to Greenwich in the Philadelphia area, although not in Gladwyne proper. “A lot of people are moving from mansions and buying condos in the city,” she said.