Alder Manor: the mining fortune that became a school, then a ruin

Alder Manor sits on a rise above the Hudson in Yonkers, New York, and it has had at least three lives. It was built as the home of one of the richest men in America. It became a school. And then it stood empty, was looted, and waited — a mansion that outlived every purpose its builders could have imagined.

A house for a copper king

Alder Manor was built in 1912 for William Boyce Thompson, a mining magnate who made an enormous fortune in copper and who would go on to found the Boyce Thompson Institute for Plant Research. The architects were Carrère and Hastings, one of the great firms of the age, and the style was Renaissance Revival — a grand, formal house meant to look as though it had always been there.

Thompson named the estate after Alder Gulch in Montana, the mining district where much of his wealth had come from. The family lived there for decades, and the house became a landmark of Yonkers. One of its stranger features survives to this day: the north facade incorporates the actual facade of a sixteenth-century Italian church, shipped across the ocean and rebuilt into the wall.

From mansion to school

Thompson died in 1930, and in time the estate passed to the Roman Catholic Archdiocese of New York. The mansion became the Elizabeth Seton High School — the first Catholic high school in Yonkers — and later a junior college. For a generation of students, the grand rooms and long corridors of a Gilded Age mansion were simply where they went to class.

That life ended too. The college merged with Iona College in 1989, and the campus closed in 1995. With no one to watch over it, Alder Manor was left to the weather — and to thieves. A brass nameplate, a chandelier and a Tiffany window were among the things taken. The house that a mining fortune had built was, for a while, simply a target.

A long restoration

In 1997 the estate was bought by the Tara Circle, an Irish-American cultural organisation, for about 1.2 million dollars, with a restoration estimated at twice that. Progress has been slow, but the house is still there — and it has found a second career as a filming location, appearing in films such as A Beautiful Mind, The Royal Tenenbaums and Mona Lisa Smile.

Alder Manor was listed on the National Register of Historic Places in 1982. It is a reminder that abandonment is rarely the end of a building's story; it is usually just the middle of it.

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Related places

If this one stayed with you, these entries sit in the same corner of the archive:

• Villa Lewaro: the mansion a self-made millionaire built — United States
• Lynnewood Hall: the Gilded Age mansion that outlived its world — United States
• Halcyon Hall: the college that closed and never reopened — United States