Most open houses feature a hovering real estate agent, a stack of listing sheets, and -- if you're lucky -- a pot of coffee and some cheese and crackers.

But at the Pinehills, where the koi pond and home movie theater can come standard with a $1 million-plus home, think celebrity chefs and haute cuisine.

To attract buyers, developers of this massive planned community in Plymouth -- the town where the pilgrims landed, about 40 miles south of Boston -- called in A-list chefs to cook in their new model homes at an open house.

They can't afford not to. High-end houses are becoming harder to sell in some of the nation's hottest real estate markets, which are being flooded with listings as baby boomers downsize. Rising interest rates and energy costs may be scaring off some buyers.

"It's turned from a seller's market to a buyer's market," said Greg Spier, who builds large custom homes in suburban Boston. "The marketplace has become astute. There's more inventory. People are becoming pickier. Maybe there's eight to 10 homes to look at. A year ago, maybe there were one to three."

The changing landscape means real estate agents are going to great lengths to attract choosy buyers of these multimillion-dollar houses.

In Miami Beach, agent Zahara Mossman says she uses podcasts to provide online audio descriptions of her listings. She said it's something that sets her apart from competitors and is critical to her success. Potential buyers can go to her Web site, and click into an audio description before deciding on whether to see it.

"The competition is fierce," she said. "I have an edge."

Mossman said the market is "as hot as ever," but noted that two of her wealthy clients -- "diamond mine people" -- recently opted to rent instead of buy, convinced that luxury level prices are falling.

"They're going to rent for a year and watch the market," she said. "They have money to buy; they're just cautious."

Warren and Sarah Bland are looking for a new home but are in no rush. They sold their Brentwood, Calif., home two years ago -- making a gross profit of $719,000 -- and signed a three-year lease in Studio City.

"We knew a little over two years ago that we were in a bubble," Warren Bland said. "We felt when we saw the price in Brentwood nearing $900,000, wouldn't it be good to take our profit and rent for awhile."

Bland, 63, author of "Retire in Style: 60 Outstanding Places Across the USA and Canada," said Ithaca, N.Y., which earned high marks in his book, probably is their destination. Several homes listed for $350,000 -- nearly double Ithaca's current median sale price -- have remained on the market since August. That fuels his belief that asking prices will fall.

"We're perfectly prepared to wait until spring," he said. "Prices have stabilized in Ithaca. They may indeed drop a bit by spring."

The trend away from supersize homes is one reason big houses are staying on the market longer.

A home on Boston's North Shore that sold in 30 days in the spring may stay on the market four months today, said John McQuaid, who owns Private Properties brokerage, specializing in the luxury home market. Still, he's optimistic that key economic trends -- interest rates and employment -- will help keep the market from stagnating.

But it's become a buyer's market with more room to negotiate prices. Manhattan's average price in the luxury market dropped 26 percent to $3.8 million in the past three months, and overall the number of days on the market increased by 30 percent, according to a report by Prudential Douglas Elliman, which defines "luxury" as the top 10 percent of the market.

At the Pinehills complex in Plymouth, the 5,140-square-foot homes include a seven-seat movie theater, a putting green, and "members room" that features a wet bar and poker table, along with the koi pond and bridge leading to the front door. The model homes are priced between $1.2 million and $1.6 million.

Top Boston chefs were recruited to help kick off the opening of the model homes. They cooked in the new kitchens at a $125 per ticket fundraiser for Children's Hospital.

"It takes a longer time to make a decision when you're spending [more than $1 million]. This showcase is going to let them see it, touch it, feel it," said Pinehills marketing director Donna Tefft.

For Terri Edelstein and her husband, Tilden, the open house "gave us a sense that the community is vibrant, friendly and warm."

The Edelsteins, who are retired, have their 4,000-square-foot home in Grosse Pointe, Mich., on the market and plan to relocate. They're considering the Pinehills in Plymouth, Cape Cod, and Quechee Lake, Vt., but have not made any offers.

Other model houses at Pinehills come equipped with putting greens, wet bars and poker tables, all designed to spark sales of new homes.

In the Pinehills high-end development in Plymouth, Mass., the finishing touches are applied to the living room of a model house.

The Pinehills developers are offering amenities such as a koi pond and a movie theater on new houses that are priced at $1 million or more.

Workers touch up another model house at Pinehills, a planned community 40 miles south of Boston with price tags ranging to $1.6 million.