While Ms. Wang wants to remain within the Jericho school district, she has decided her home is too big for a family of two. The house has more than 7,000 square feet with six bedrooms, and four acres of grounds, with a tennis court and in-ground swimming pool. She purchased it with some of the furnishings, including the oil painting of a hunting dog above the fireplace in the den, and the complex audiovisual equipment in the media room that she has never used.

“I loved this house when I first came, but it is too large for us,” said Ms. Wang, who is hoping to move to a more manageable home of around 5,000 square feet in a gated community that offers 24-hour security. Her home has a private gate, but no security guard. It is listed for $3.68 million.

The price tag is purposeful — the numbers 3, 6 and 8 are all considered lucky for the Chinese. “We actually have another property in Sands Point, and we also listed it at $3.68 million,” said Mr. Wu, who is marketing the house with his partner, Tina Wang, a saleswoman at Daniel Gale Sotheby’s. “We might soon list my mom’s house, and I’m thinking we will ask the same price.”

Choosing numbers thought of as lucky is widely embraced as a way to attract Chinese buyers. At the Estates at Green Fields, a new development in Old Brookville, the number 4 does not appear anywhere. That is because it is considered extremely unlucky, as the sound for 4 is similar in Chinese to the word for death. On the even side of the street, the addresses jump from No. 2 to No. 6.

Conversely, 8, considered the luckiest number because it is a homophone for the word for prosperity, is nearly everywhere. “Most of our homes are between 8,000 and 8,888 square feet, and the asking price has to have an 8 in it,” said Raymond Hakimian, who with his father owns the project’s developer, the Mashady Development Corporation of Roslyn, N.Y.

Feng shui, a system for creating a harmonious environment, was a guiding principle for the design of the Estates at Green Fields, where houses cost $5 million and higher. For example, Mr. Hakimian said, most face the preferred direction, south, letting in more sunlight, and none of the front doors open directly onto a staircase, which is considered unfortunate because of the belief that the energy from the stairs could easily run out of the house through the front door.