Boston's unofficial move in day of September 1 has come and gone, and like a U-Haul truck on Storrow Drive, some landlords find themselves stuck. They are stuck with vacant properties.

"This September 1 came in with more inventory. The city itself right now has about 16.79% more inventory than it did one year ago today," said Demetrius Salpoglou, CEO of Boston Pads.

He says the vacancies are due to a lack of international college students this year, and in particular, near colleges with graduate programs in math and science.

"It's very acute in certain neighborhoods, but some other neighborhoods you're not seeing much impact at all," said Salpoglou.

Four areas hit hardest

Boston Pads data shows four areas have been hit the hardest. They are Mission Hill, Fort Hill, Fenway, and the Sym

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