(Bloomberg) — President Joe Biden is pushing to close a tax break that helped his predecessor amass a fortune.

The Democrat has proposed narrowing a tax code provision that allows real estate investors to avoid capital gains taxes when they sell property, as long as they use the gains to buy more. Former President Donald Trump’s most valuable investment, which traces back to his $95 million purchase of a west-side Manhattan development site, has benefited from the rule.

In 2005, when Trump’s partners agreed to sell the site for $1.8 billion — a deal Trump resisted — his cut was about $500 million. Because the partners then used the capital gains from the sale to purchase two office towers, they and Trump didn’t owe any tax on their gains. Today, Trump’s stake in the buildings is worth about $1.2 billion before accounting for debt. Biden’s plan would eliminate that kind of maneuver for Trump and thousands of others with real estate…

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