When Microsoft co-founder Paul Allen died on Oct. 15, 2018, he left behind an estimated US$26 billion that he wanted to largely leave to charity.

Allen died at 65 of septic shock after a yearslong cancer battle. He’s back in the news because his estate is finally selling an asset that represents nearly a quarter of his fortune: the Seattle Seahawks football team, which he bought in 1997 for roughly $200 million.

The sale of the 2014 and 2026 Super Bowl champions could fetch more than $6.5 billion – a potentially record-breaking sum.

Allen never married and he had no children. His sister, businesswoman Jody Allen, is his estate’s trustee and executor. She’s now overseeing the Seahawks’ sale.

As law professors who study the transfer of property after death, we can explain why it often takes a long time for complex estates to settle following the death of ultrawealthy people.

Settling the estates of billionaires

When most people die, the distribution of any wealth they leave to their heirs or charitable causes can be relatively straightforward.

If all goes well, the process will take a few years at most. Homes, vehicles, bank accounts and retirement assets can........

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