NEW YORK — A New York City council member launched an investigation Monday into the Kushner Cos.’ routine filing of paperwork falsely claiming zero rent-regulated tenants in its buildings, saying that the deception should have been uncovered long ago because the documents are online for all to see.

Councilman Ritchie Torres said the city’s buildings department should have spotted the wrong numbers because they were contradicted by tax documents filed with another city agency.

The Associated Press reported Sunday that a tenants’ rights watchdog found that the Kushner Cos. had filed more than 80 construction permit applications for 34 buildings across the city between 2013 and 2016 saying it had no rent-regulated tenants. But tax documents showed more than 300 rent-regulated units.

Asked about the Kushner Cos. documents Monday, Mayor Bill de Blasio said that “if it proves to be true that they lied to evade regulation, they have a problem on their hands.”

The false documents allowed the Kushner Cos. to escape extra scrutiny during construction projects, when the family real estate development firm was run by Jared Kushner, who is now senior adviser to his father-in-law, President Trump. Housing Rights Initiative, a watchdog group, said the false documents made it easier for the Kushner Cos. to harass rent-regulated tenants so that it could push out low-paying tenants and replace them with higher paying ones.

Current and former tenants of three buildings in Queens once owned by the Kushner Cos. told the AP that they were subjected to extensive construction, with banging, drilling, dust and leaking water that they believe were part of targeted harassment to get them to leave.

“It was noisy, there were complaints, I got mice,” said mail carrier Rudolph Romano, adding that he also bristled at a 60 percent rent increase, a hike the Kushner Cos. contends was initiated by the previous landlord. “They cleaned the place out. I watched the whole building leave.”

Tax records show rent-regulated units that numbered as many as 94 when Kushner took over fell to 25 by 2016. The Kushner Cos. sold the three Queens buildings last year for $60 million, nearly 50 percent more than it paid.

“Kushner Cos. made the lives of many of its tenants a living hell,” said Aaron Carr, founder of Housing Rights Initiative, which is joining with the Torres committee in the Kushner investigation. Construction harassment is “a tool designed to make the lives of rent stabilized tenants so unbearable, so intolerable that they are forced to give up the most valuable thing one can have in the midst of an affordable housing crisis, affordability.”

Also Monday, the office of New York Attorney General Eric Schneiderman said it is looking into the issue and planned a meeting with tenants’ representatives in coming days. Both Torres and Schneiderman are Democrats.

The Kushner Cos. said in a statement Monday that “the investigation is trying to create an issue where none exists. Kushner Companies did not intentionally falsify DOB filings in an effort to harass any tenants.”

Submitting false documents to the city’s Department of Buildings for construction permits is a misdemeanor, which can carry fines of up to $25,000. But real estate experts say it is often flouted with little to no consequences.

Landlords who do so get off with no more than a demand from the city, sometimes a year or more later, to file an “amended” form with the correct numbers.

Housing Rights Initiative found the Kushner Cos. filed dozens of amended forms for the buildings mentioned in the documents, most of them a year to two later.

Before Jared Kushner stepped down as CEO last year, he sold off part of his real estate holdings as required under government ethics rules. But he retained stakes in many properties, including Westminster Management, the Kushner Cos. subsidiary that oversees its residential properties. A financial disclosure last year showed he earned $1.6 million from his Westminster stake.