MOUNT KISCO, N.Y. (AP) _ When Ivan Boesky returns to his mansion after serving time for insider trading, there won't be a Jeffersonian dome to greet him.

The North Castle Zoning Board of Appeals voted 3-2 Wednesday night to deny a request from Boesky's wife, Seema, to cap her 17-room Georgian home in Mount Kisco with a dome similar to the one that tops Thomas Jefferson's Monticello home in Charlottesville, Va.

Mrs. Boesky's plans were opposed by 11 neighbors.

She needed special permission from the board because her plans would have added a third floor to the house, which is at the center of a 76-acre estate called Northview.

North Castle zoning law limits buildings to 2 1/2 stories.

Those voting against the proposal said approval would have set an undesirable precedent. Those supporting the dome said it would have had little impact.

Boesky paid a record $100 million fine in 1986 to settle federal Securities and Exchange Commission charges of insider stock trading and is serving a three-year prison term after pleading guilty in April 1987 to a federal conspiracy charge. Boesky will be eligible for parole in March.