Julian Robertson’s three new homes on New Zealand’s North Island are a matter of practicality. The co-founder, chairman and chief executive of the investment firm Tiger Management needs the residences for his growing family, which now includes his three sons, their wives and his nine grandchildren.

When Mr. Robertson first built a vacation house on North Island more than a decade ago, he imagined his clan all staying there together under one roof whenever they visited. “It’s a destination I’ve long loved and enjoying sharing with my loved ones,” he said.

That first home, along with the new ones, are on the same 6,000 acres of farmland in the Bay of Islands as Mr. Robertson’s upscale hotel, the Lodge at Kauri Cliffs.

The property is part of Robertson Lodges, a trio of hotels in New Zealand that also includes the Farm at Cape Kidnappers near Napier and Matakauri Lodge, on the South Island.