Boston’s rental market revolves around students, and with the status of international students in flux, some neighborhoods are seeing far more unsigned leases as Sept. 1 approaches than in recent years.

As some universities’ international students amount to a quarter of their student bodies, some neighborhoods are being hit hard, according to data compiled by Boston Pads .

Boston University , Northeastern University , and Harvard University are among the colleges who enroll thousands of international students, who contribute nearly $4 billion to the Massachusetts economy. The Trump administration’s heightened vetting of visas and travel bans are expected to keep some of those students off campus this year.

BU and Northeastern did not return a request for comment about inter

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