One of the nation’s most voracious consumers of trophy real estate is back on the hunt.

Since the mid-1990s, software billionaire Larry Ellison has accumulated hundreds of millions of dollars worth of top-shelf properties around the world. The portfolio of Oracle Corp.’s co-founder includes five adjacent lots in Malibu, Calif.; a Newport, R.I., mansion formerly owned by the Astor family; a historic garden property in Kyoto and an estate in Rancho Mirage, Calif., with a private, 19-hole golf course.

The list of serial buyers of trophy properties, while thinning in recent years, includes Paul Allen along with Roman Abramovich and other Russian oligarchs. Mr. Ellison has a distinctive buying pattern: When he finds an area he likes, he takes a flood-the-zone approach. He often buys several adjacent properties to combine into a single sprawling compound. At the same time, he acquires other noncontiguous properties nearby, increasing his overall holdings in a desirable area.

Mr. Ellison has been applying this approach to a new location: Lake Tahoe, the resort area straddling the California-Nevada border. Records show Mr. Ellison has spent $102 million in the last several years buying property, both on and off the market, to assemble three different parcels fronting the 191-square-mile lake. On one of them, purchased over three years for a total of $58 million, Mr. Ellison is constructing a compound with more than 18,000 square feet of living space as well as a pond with an island, waterfalls and a tennis court with a pavilion, according to plans submitted to Washoe County, Nev.

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