While the Trump connection piqued the interest of many people in attendance, such events soliciting investors for projects in the United States are not unusual in China. The so-called EB-5 visa program awards foreign investors the right to live in the United States for two years and a path to permanent residency, in exchange for investments of at least $500,000 in American development projects. A bright red line near the top of the posters in the Four Seasons lobby prominently mentioned EB-5 visas.

About three-quarters of the roughly 10,000 investor visas issued last year went to Chinese nationals.

Although the program was created as a way to finance projects in economically troubled neighborhoods, it has instead turned into a form of cheap financing for luxury real estate developers. Applicants are primarily seeking the visa, so they typically do not seek a significant return on their investment.

The United States Government Accountability Office, the investigative branch of Congress, has criticized the visa program for its lax safeguards against illicit sources of money.

Kushner Companies has tapped the program before: The firm raised about $50 million from Chinese investors in EB-5 funding for another project in Jersey City, a Trump-branded luxury apartment tower that opened in late 2016.

As part of the marketing effort to finance that building, a firm used by Kushner Companies distributed a Chinese-subtitled video leading viewers behind the wheel of a car in New Jersey accompanied by “Woke Up This Morning,” the theme song from the television show “The Sopranos.”

Kushner Companies has declined to identify the investors it found for that building.

Mr. Kushner was a manager or president at several entities associated with the Jersey City project that is now seeking Chinese investors. He divested his interests in that project by selling them to a family trust of which he is not a beneficiary, said Blake Roberts, a lawyer at WilmerHale who is advising Mr. Kushner on ethics issues.

Mr. Kushner has divested his stakes in dozens of entities used to hold family company investments, although he remains the beneficiary of trusts that hold stakes in hundreds of others.