For the first time in decades, the federal government is seriously wading back into housing policy, but most experts say its impact on high-cost Massachusetts, where leaders are desperate to see more housing built, will probably be modest.

A new bipartisan housing law includes financing reforms and zoning incentives that could chip away at some of the many barriers to building in Massachusetts. The flashy provision that has drawn the biggest headlines, however — limiting institutional investors from snapping up lots of single-family homes — is not likely to have much impact here.

The 21st Century ROAD to Housing Act became law without President Trump’s signature this month. Though he had eagerly touted the bill in the run-up to its passage, Trump declared just before a scheduled signing ceremony that he wouldn’t sign it until Congress passed his unrelated election reform measure. But he didn’t veto the bill, so it became law 10 days after it was passed.

A centerpiece of the bill is a ban on institutional investors who own more than 350 single- family homes buying more units, a provision that backers say will lessen the squeeze on the homebuying market.

US Sen. Elizabeth Warren, one of the bill’s champions, hailed the new investor rule as a significant reform.

“This bill, for the first time ever, says to private equity, ‘You do not get to come into our neighborhoods, buy up all the housing, turn us into a nation of renters,” Warren said on GBH News radio in June. It is, she said, the “first bill ever to say no to private equity.”

But local housing experts point out the rule takes aim at a dynamic that has reshaped Sun Belt metros like Atlanta and Phoenix far more than it has many other areas of the country, including Greater Boston, where large-scale investors buying single-family homes is not much of an issue.

While some regions may feel some relief, the provision is a “big nothing burger” here, said Adam Ploetz, manager of housing and neighborhood development at the Metropolitan Area Planning Council, a regional planning agency serving Greater Boston.

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